It's bad practice but I'm doing it for science - 18650 DIY building for failure
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- Опубликовано: 11 сен 2024
- Finally - • #Cell5 The Conclusion!... The conclusion!
It's bad practice but I'm doing it for science - 18650 DIY HBPowerwall building for failure ▶▶ Open up the description for more details ▼▼▼
■▬▬▬▬▬▬ Episode 1 of 2 ▬▬▬▬▬■
Got wind of someone making his 18650 DIY Tesla Powerwall without capacity testing their cells. This is my reply! Instead of trying to talk them out of the idea I would like to document the reality of doing a powerwall this way as safely as possible.
The downside to this is I'll be fully on the grid for about a week while I test and film but fingers crossed I get the results I expect - if not I guess we will all win.
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Thanks for tuning in as always!
Pete
I have only built without testing once. And failed as soon as I got to initial balancing as one of the cells was totally dead.
Lesson learned: Measure voltage, charge, capacity test, recharge, rest. Rinse, repeat, build, win.
I now only skip indepth testing on brand new cells but even still I'm more inclined to capacity check and voltage match to ensure the finished pack will maintain good balancing when in use.
Yep, new cells you can take a lot of short cuts but some things like votage and perhaps IR should be tested.. I test IR on all cells now also.
Out of curiosity, and a spirit of reckless experimentation, I ran 50 ma into a few laptop cells ( about 100 ) at
so in the long run it would be better to build the power wall with new batteries?
@@WilliamNewberryTheHandyRealtor I would expect it would be easier to match new cells. I did go on to build 5v, 5.5v and 9v ups supplies for cordless phone bases, cell phone repeaters and a 19.5v laptop recharger / battery bank using reclaimed cells. Very happy with the results. Most were 4 matched cells in spring clip holders. The laptop recharger was 32 cells, welded together with a load balancer.
@@garygough6905 what do you use to measure the amp/hours or how is it calculated?
@@WilliamNewberryTheHandyRealtor there are several useful tests. On reclaimed batteries I like to cycle them in a BT-C3100 charger. Charge, discharge and measure and then recharge and compare the amp hours needed to charge to what had discharged. Then let them sit for awhile and check the voltage.
A fast test for battery health is measuring internal resistance. You do that with a VOM and an external load resistor. It should be rated to dissipate the heat generated. For instance a 10 ohm resistor loading a 4.2 volt fully charged Li-Ion cell will draw 420 ma and dissipate 1.764 watts, so a 5 watt resistor will be safe. 10 watts will be cooler.
The test is read the open cell voltage, then apply the load and read the voltage under load. Then it's Ohms law math. The voltage across the external resistor tells you the currant. The difference between open and loaded voltage is what is being dissipated across the internal resistance will give the internal resistance ( V/I = R ).
These numbers relate to the maximum draw rate and cell heating, but they don't tell you the stored energy. As an example I have two reclaimed cells from the same group in one pack they are both showing an internal resistance of 1.6 ohms, but one stored 1.2 amp hours and the other only 0.2. The resistance is high enough that I would be hesitant to use them at discharge rates over 500 ma, which would also be a .8 volt drop.
R.I.P. Toaster 20??-2017
"Yeah, because the master never played with you."
The toaster will live another day ...lol
HBPowerwall a quote from the brave little toaster, a movie I was raised on. 1985 I believe.
don't burn your house down think about fire and how your gonna stop thermal runaway from old used cells looks like it's in a metal shed hopefully away from your house
It'll be right mate :)
Good ANZAC spirit right there 😎
"Broke the toaster" - subscribed.
Welcome...
Same lol
This is really awesome. now I also what to build it too
thanks for the inspiration.
Good lord you battery hoarder! XD i really enjoyed this setup.. keep up the good work dude!
thanks Jay, it's been a great journey building and testing everything.
Been 18650ED ? - www.diypowerwalls.com/t-You-been-18650ED Grab a Tee or Hoddie & help support my journey!
HBPowerwall i think that wind was me.
we talked to you last night and live video someone mentioned testing batteries and now you're making a video good to see you do pay attention to us thank you
Soldering cells together? I was told at Total Battery, that it is better to weld the cells together. Their explanation was that heating the end of the cell up for the time required to melt solder and attach the wire is sufficient to damage the internal connection of the batteries cells.
Totally possible - i'm four years into their theory with a real world test.
Damn you guys are lucky to be able to have access to busted battery packs, I really wish I could get cracking on a project like that I have the really big 2v batteries with the water acid, Pain in the butt! but is what I could do at the time of install, the guys out here try and conk us out for half the load of what the batteries cost new and I am not going to take a gamble if I don't know what I'm going to get, I know that most of the time there will be one or two cells maybe bad, but taking that the actuall modules cost 2KNAD new and they want 1KNAD for a busted one theres no way I could just as well by new LG or Sanyo 18650's for that price! Love the videos cudos! Regards Charles from Namibia
Дорогой друг! Вся бытовая электроника рассчитана на 220 вольт! Если эти приборы переделать на питание от постоянного напряжения, то ваши аккумуляторы прослужат гораздо больше!
Смотрите: преобразование постоянного напряжения в переменное теряется где-то 20%, далее сам прибор имеет трансформатор, который из переменного 220 вольт преобразовывает в одну из напряжений линейки 12 вольт или 5 вольт или 3,3 вольт или в другое постоянное напряжение и в любом случае 20% - 50% это потери! Подумайте об этом. Можете использовать приборы, предназначенные для работы в автомобилях, они обычно рассчитаны на подключение 12 вольт!
Good morning
why not use nickel strips per point and put a bms? That would be easier, right?
THANKS
Love the video! Working on using wasted energy projects. Wind, solar, water. Anyways great job man!
You need a big resistor on alligators. Thats what I use to balance my 6s when I first build em. Just clip it on and let it cook till its where you want it. I even run more than one across more than one cell sometimes while its charging just to pull em down. Don't forget its on there though or your pack go poof.
wiring batteries directly without current limiting device was very bad idea
"...and I just broke the toaster" sorry for the toaster but that produced an honest to goodness guffaw from me while watching. :P Cheers Pete, keep making the awesome vids!
FYI: ALL 26650'S ARE MIS LABELED BATTERY WITH A 18650 BATTERY PACKED INSIDE THE CASE.
"broke the toaster" and good music = like from me
That poor toaster - a few quiet words were spoken ..lol
I recommend sticking with deep discharge lead acid. Less chance of burning down a house. Never heard of lead acid exploding, but lithium can blow up dangerously
dam a 20 second google search will show you hundreds of Lead batteries that have met their end with explosive force. To be fair people have burnt their house down while doing the dishes.. it's all risk management i guess .
@@HBPowerwall have you got a link showing lead acid battery exploding with fire?
@@SwenserI don't but i'm sure you can google
Whoa!!! Havent heard of this method before but like you said to each his own... or Her???
Isn't it bad for the batteries to discharge straight from one pack to another? Shouldn't you put some kind of load/resistance between them?
depends on the resistance of the wired used and the voltage difference i guess
How often do you check the cells in the power shed for "heaters" with the thermal camera?
weekly
and it's not just the cells, it every connection, solar panel connections cables etc..
I would like to know what proper way to test these batteries
That is crazy they could have a cell that does 500mah and cells that do 2400mah or so on. There is no way to know if the pack is balanced?? Sorry about the toaster
Did you get a new toster? Love the video.I can see how much work you put into it.
Hot Glue buddy... wiffee will never know... lol
I like you so I will not tell :) happy pops day brother.
Are the longmons bluetooth, how did it know to reduce the voltage?
longmons are physically connected bluetooth is not consistent enough
Yep, we're asking for an explosion an a terrific fire here. There won't be anything left of that house. LiOn batteries need to be spaced with a barrier between them to keep one from igniting the other, and individually monitored for temperature. It takes just one cell problem, tested or not to cause a runaway ignition reaction. How do I know? We blow them up in a test chamber at work to study them when making battery backup units for enterprise computer systems.
And OMG, I just noticed the direct-to-cell soldering! Heating a battery with a soldering iron will damage the adjacent battery chemistry, pushing the cell further towards failure. Please read any battery manufacturer, that's why they use spot welded tabs - to prevent heat damage to the battery. It's bad enough on NiMH, but you're doing this to lithium cells! But when you have an epic failure, it'll make a great RUclips video!
You bet it'll make for a good video - one would hope it'll pay for the repairs :P
nice job again, the blue batteries in your shed had you wrapped them all yourself?
am i understanding this correctly that this is one single large parallel cell and they are put into series on the wall itself? iv got alot to learn about these powerwalls.
11:25 "connect the" ahahahaa
You have shown how to test for a bad hot cell that was once good. There is a point where a cell goes from being good to bad. So your wall could have one cell that decides to freak out and go hot. How do you protect from this?
I have a few there were good that went bad - all that happened so far is they went zero volt - blowing the fuse. Had none reverse or vent as yet
shit you work fast
100x faster in fact :)
wish i had a 100x button in real life
Nar, life passes too quick these days.. :)
Is there an advantage to soldering a long copper wire rather than welding nickel strips?
They both have their advantages for sure!
How come that you can just touch the battery pack leads with your bare hands ? Isn't DC with a couple of amps rather dangerous ?
You should always treat stored energy with respect. I'm only picking up a 4v cell.
Question: Why go through all the trouble of using hundreds of smaller batteries when you could use a a dozen of the larger ones? Is it performance, cost, efficiency, or something like that?
I've done the whole Lead, AGM thing, finances played a part in not wanting to buy new cells - then this idea came along and it got a little out of hand. Then it worked so well it got even more out of hand.
lately i been wanting to learn how do do this and been wanting to build
something. im JUST starting. helped clean a hoarders house which had 2
kobalt 80V lawn mower batteries which never saw use and degraded just
sitting in that rate hole. of the 40 cells i got 20 in good "physical"
condition.
before i even bother testing charger discharging ( and
buying all the relevant equipment) i need to start stocking up to make
it worth my time. any suggestions for where i can acquire sources? this
weekend im going to ask around at local Lowes/Home depots and see if
they are willing to allow me to give some of these battery packs a
second life.
That's a rather interesting way to set up a powerwall module. Buying bulk cells from a place like Batterybro is a better idea.
how is it any better than my project? better cells at much higher costs or lower cost or free cells at the expense of capacity and lifespan?
Thanks for these videos. I'm learning a lot. Specifically what gauge wire do you use as a 'fuse' to connect the cells into the buss?
All stuffs i buy can be found here - www.diypowerwalls.com/t-HBPowerwall-Official?pid=883#pid883
0:09, This is how I got a new battery that was leaked and dead 😅
Are you going to try and see if the faulty ones will recover, or are they goners and a waste of time.
Just a fun test really to see the end result with out guessing
I kind of meant the hot ones and the ones that don't hold charge, but do you mean that some in that pack will be bad even though they passed that guys recommended testing procedure because he didn't do charge testing.
hot ones are instant bin jobs, all the other
I'm mainly looking for battery info, so I can't wait for that one. Good work.
Good stuff mate. Is the difference in the voltages common? I'm still working on my first 80 cells so I have a long way to go and looking at the difference in voltage shocked me. Some more I need to learn! 🍻
Lmao silly AD timing, this ones way to charged RAID SHADOW LEGENDS!!!!!
After longer time what do you think is the better System: the BatteryHookup Nickel Fuse or the System of this Video and: how often do you need to check (and repair) the fuses?
OOh hard call, haven't tested enough to make that call - but Battery Hookup's is STUPID fast to build if you own a spotwelder. If you don't the old way is a very good path to follow
I have already used cells that were under voltage of 1.5v-2v (I used imax charger to revive them) and after recharging for the first time they have continued to work well, retaining voltage around 4.05v-4.15v. Why do you discard them? Tks!
I test all cells above .0.2v voltage is not an indicator of cell health
HBPowerwall I've always thought that the most reliable way of knowing battery health was by measuring its internal resistance
I guess it would be if you could do it cost effectively and accurately, till then i'll just use the Charge, rest, Voltage test, charge, discharge, charge, Voltage test method
Your method is a good method, also use it. But to be sure, it is good to measure internal resistance. This device accurately measures internal resistance: www.ebay.com/itm/battery-Internal-resistance-Meter-tester-lead-acid-lithium-cadmium-nickel-metal/111865011105?ssPageName=STRK%3AMEBIDX % 3AIT & _trksid = p2055119.m1438.l2649
Did you know? Tks
that is a guess just like every other device we have to ir testing :( too many variables for it to be practical voltage, temp etc
It’s an issue of energy. Energy in energy out. More amps in and over the 4.2v limit these batteries will catch fire. Use hot breath on a candle it won’t light use a flame thrower and you’ll burn the house down. Hot breath = 0.1 amps Flame thrower 100amps. Just a random example explanation.
Nice editing and production. Good work!
help me understand the problem with using less than 2000 mAh cells. as long as the packs are balanced, even if they have a combination of 500 mAh and 3000 mAh in the pack, if the overall pack is consistent from pack to pack, then it should balance and produce (albeit eat a lower overall capacity than a pack made of all 2500 mAh cells). is my thinking wrong? I plan on using the good cells I have, even if they have a capacity of 1900. if that's bad, then I want to know, and won't. however, I don't want to waste a good cell for 100 mAh.
DIY Tesla PowerWall You can mix and match capacities of the cells that are going in parallel as long as they are all the same chemistry. I use my weak cells to tweak the capacity of each pack of parallel so that when you put them in series each series string has a matching capacity. When you have cells in parallel they will all be at the same voltage so when you draw the pack down all of the cells in parallel will still match the same voltage but the cells with lower capacity will discharge at a slower rate than the cells with higher capacity.
The reason you don't generally use batteries under say 1500mah or 2000mah whatever you decide to go with, is that each space in a power wall pack is valuable and so it is kinda pointless to use the cells that are below this capacity for an installation based on the amount of work needed to build each pack.
Have you ever heard not to mix power cells
You shouldn't doesn't mean you cant in a lower power application
@@HBPowerwall lol
So you didn't check internal resistance, or Mha capacity! (Very important when arranging cells) Also soldering cells destroys your cells due to extreme heat. And increases resistance and heat! And loose efficiency.
Fuse wires are smart but should still be spot welded.
this was so long ago, we have already passed your suggestions lol
@@HBPowerwall lmao 🤣 just saw the date on video, omg not my Fault stupid Google recommending me old Videos, lol well hopefully i save the next guy who gets suckered in as i did!
I will try and catch up to your channel since your new to me☆
What type of solder do you use? Mine doesn't stick to the cells..
+Unnamed. Plumbers solder 40/60
Thats amazing. i just wonder when i saw all the massive packs on the wall and some small board on the battery pack. what are the pack for to run fully only 4.2v? on what ever how many thousands of Mah of batteries
looks like i get it now. home power bank. i wanna build something like that.
Hallo will mir auch ein akkupack bauen das müsste 72v und 50ah haben wieviel Batterien bräuchte ich da und was für welche
it's not like they are not not fusing them and I mean that's something the getting hot and holding voltage but holy crap how much do you have into your system
Recharging 8 cells in parallel connection using IMAX, 8 is the limit....? Heard 16 we can charge at a time is it true??? If 16 or 8 do we need to regulate high voltage,amps if we add more cells???
Seems like a good way to presort cells, but it is easy for a low-cap cell to slip by.
All too easy, but hopefully i can prove it's a very bad idea..
I said presort to not waste time on cells that are failing anyways. Binning is still a must.
I already have solar. How or where can I find a DIY on doing a 30kw setup?
Bunch of my extra stuff here www.diypowerwalls.com/t-HBPowerwall-Official
What is wrong with cells, that heated up?are they faulty
Fire hazzard - a lithium cell that heats up has high internal resistance
@@HBPowerwall I have many cells that warm up when in test in charger (littocala), but only some of them have resistance of 125mOm. Rest of them at about 40-60mOm
It's also dangerous as just sitting in front of unknown cells & listening to heart's on fire...
sure..
Good video.
I want to add a 74 cells. Pack to my Tesla 24V battery. Were can I gel it? Hope you can help me. Jose
@HBPowerwall How hot is too hot? I have some that stay cool charging, but heat up a little on discharge.
if they are hotter than the others charging I recycle them... even just a little warmer and they are out
Every thought about heat shrinking or insulating your tools?
Yep!, do I ever get around to do it ... nop! should i YEP - will i - Sometime soon...lol
Hey, love your vids man keep tearing these packs to shreds.. quick question. I've gone through a number of your vids and many others in regards to these lithium powered systems using the MPP solar inverters, but i haven't found a straight answer on how to set them up for lithium specifically.(might be an awesome idea for a full walkthrough vid btw). I'm about to make a 24-volt system with the pip2424lv-msd(in the U.S.) and im able to get the same size lithium pack in my area as agm, but i dont know how to setup these inverters for it.
also any idea how i would go about setting up a longmons system for a chevy volt pack?
Were you spending all this time manually testing and balancing your batteries because this was before you had the extra hardware to automate that for you in the final setup?
No spent all that time so I could sleep at night!
HBPowerwall, so, old batteries are that potentially dangerous, and all the monitoring and control hardware is not sufficient to compensate for that?
Can't compensate for being stupid and putting known faulty cells into a pack. Test them properly, only use higher mAh cells - stands to reason there will be less maintenance & will last longer.Time will tell if it was time well spent or not..
what is the long black board that you connect to the battery pack?
It's part of the BMS - it's called a longmon - you can find them here - www.batrium.com/collections/decentralised-supervisor/products/watchmon4-longmon
Do you think we can create an emergency alarm for over charged?
Already have that with my BMS, over charger per cell & also per whole battery, along with 120 temp sensors and a bunch of other cool stuffs
what size of wire u use as an fuse, I have nickel chrome awg 32, is that safe enough for a small pack 40 cels
it would depend on your load
Like what you r doing I'm trying learn to make my own one still leaning
Thanks for tuning in
Witch a few of your videos and they have helped alot I got given a hole heap laptop batteries to make bigger better solar battery iv got Alot to learn before I go 2 far
heya 2st vlog and I'm still liking what I see
600 to go lol
Not worried about touching the module across those 4v?
+Rok Adamlje at 60v I don't even get s tingle. Still got to respect it tho
kind of first :) woho my youtube video in background :)
Well spotted buddy, you played a larger roll how ever it was edited out :)
HBPowerwall I spied NerdVille too.
hey Pete, what's your educational background? do you have a degree in electronic engineering or? ...where would be a good place to learn about the stuff you do on your page? cheers, and keep up the awesome vids!
i highly dislike censorship @pete
to clarify my deleted response, there is a link in the description, to a froum pete mentions about 10 times per video.
back to using the internet - you always have to check for your local legislation on what you have to use by your local-code, and what you are allowed to do in the firstplace, it is similiar across the globe by design, copper is still copper around the planet, but 6awg cant be found at all places, same with 10mm² or 16mm², or specific crimps, connectors and such - to say it short, you will not finde one person for all your questions or problems, if you do, you are basically buying the powerwall from them and not building your own
what's the difference between Enhance and Balance version for bms ? thank you
Never heard of a 'enhance' version - perhaps someones stupid marketing idea?
I'm new to the battery game. Doing my due diligence of research (even ordered the book "DIY Lithium Batteries" by Micah Toll) before I attempt to build a power wall. Could you give us some background on why this is bad practice? I image it has something to do with stressing the other battery packs. I didn't plan on using used/refurb cells but did plan on purchasing cheap cells from eBay or Aliexpress. The ones I'm aiming for are supposedly 3.7v at 6000mAh at about $1 a piece. Just from what I know about buying cheap stuff, it's never what it's suppose to be - so I'm assuming I'll get half the capacity as listed. Are there other gotchas I should be aware of? Great video by the way! Liked + Subbed
ANY cell above 3400mah is fake! Your 6000mah cell is probably 1500mah new and with in a few cycles possibly half that. Aim for about $4 a piece and get from reputable seller. Places to start would be endless-sphere.com/forums/ or www.diypowerwalls.com both sites also have Facebook Groups
Thanks so much for the links! I figured as much by just seeing what others were experiencing. Knew it was too good to be true.
Yep, a few youtube searches will bring you a wealth of info on those crap cells
I think the main issue in doing this is you lose about 25% capacity from the worst cells
Ended up with a dozen bad cells that turned into heaters & was given away.. that said it would work in a pinch but it's dumb and dangerous if you have any other option to do it better
@@HBPowerwall Can you recommend good blutooth heat sensors( Per individual battery)
any luck with aftermarket toaster handle replacement? and does it get hot!! LMAO
So what voltage is a finished pack? Like, How many In series and parallel?
is it 1S 80P? Giving 4.20v @ 80x capacity?
Yep 4.2 fully charged - then into a 14S320P Battery from memory *was a few years ago now
brave...that's a lot of angry power stuffed in they're just waiting for a chance to wreak havoc!
+MyBigThing2010 it got the angry covered :)
Can you specify the wire gauge (not mm^2), and is it solid or stranded? Thanks.
Sorry mate for what wire the busbars or hd cable i use?
Heh, if I threw away the cells that self discharge I wouldn't have any to play with. I just don't plan to do anything important with them, maybe flashlights or similiar level of tech.
sounds like a really good plan if your short on cells.
please i would like to charge my battery on the skate faster now i have a 330W charger but 1200W would be a bit better advice i just need a power supply cc cv 48V and 20 up to about 30A ... thank you.meanwell are very expensive and aliexprews heating uz holen let you get involved in the sieves without a hitch
Interesting look forward to see how it goes wonder if it proves we have been wasting our time testing cells. I am going with no you do need to test them.
I'm on the TEST THEM team also, but it is going to be a great test win - loose or draw.
you could do another on tested cells that are 1500 to 2000 mah I noticed a few on the forum saying they would use cells that low ive been tempted when I put my packs together but I didnt go below 2000 mah good editing on the video btw
after this test is done I'll test every cell and do a good look around so to say n try to learn something from it. Was going to do quick behinds the scenes of this video showing the raw footage & editing ... Yet I sill look at it and think I could have done it better.
Looked fine to me m8 and as for learning from it before I started I watched a s*it ton of videos from all over the web I learnt more from your channel by a long way successes and occasional f*ckups haha
Where do i get the wall racks and the plastic pieces to build the strips of batteries?
I make & sell the mounts in Brisbane, Australia & the cell holders from 18650shrinkandcellholders.com/Cell.Holders
Is there a web site where I can buy the wall racks?
This site - 18650shrinkandcellholders.com/Cell.Holders - which one do if buy for the wall racks? i assume 4X what? do they snap together?
4x5 plastic holders, mount post disappeared secondlifestorage.com/t-HBPowerwall-Official?pid=885#pid885
Do you have a supplier in the us that has the wall racks? If not can I order them from you? Is there a link anywhere?
how to you manage not over discharging the cells? most protection circuits on ebay cut a 2.5v which seems too low?
My www.batrium.com BMS is COMPLETLY Configurable I can choose my low and high volts
29 minutes of my life I’ll never get back!
I'm sorry.... but thanks for donating the 29min to my watch time :P
I would never use unknown cells. and I have seen cells with low voltage .turn out to be the best of the bunch! I would test capacity and self discharge & heaters. before building a pack. I guess a 500mah and 2500 mah cell would be 1 3000mah cell. but if you could have 5000 mah would be better.
Plan on testing in many different ways after a few real world tests are complete
I really enjoyed the vid. it would be awesome to test and learn with cell 5 I've been in to small solar / wall charged backups with lead acid but I am in the process of cracking open laptop batteries that I have it would be awesome to have a Templeton to work with as well as I see the work the stats as well as some very nice cosmetics as well as solid workmanship.
Upload pictures of the fire.
at which point does it become worst practice?
The minute you start...
This looks fun
So far it hasn't been! pretty disappointing really I expected a quick failure, what I got was (for now) a working pack of batteries
Quick question. Could these things run ethereum mining rigs for about 12hrs? e.g. Twelve RX 4/580s (about 2000W per six cards)
Could, but wouldn't
Cool, thanks for the reply dude
Cool video! How would I make a power bank I can hook up to a hydro generater?
Ya need to look at my other 500 videos :P
Hey Pete, great vid as usual. Could you possibly share the link where to get that battery holder @ 9:54? Its that long multi-cell battery holder.
Cheers. SPA
I have them made up but provide all the gear you need here - www.diypowerwalls.com/t-HBPowerwall-Official?pid=885#pid885
You are talking about JehuGarcia - this is how he does it and he tells others to do likewise.
Not about Jehu.
cool u have fused links between the cells
4480 cell level fuses :)
What is the PCB you connected?
from memory, it'll be a 'Longmon' part of my BMS system from Batrium. www.batrium.com/products/longmon
So it doesn't look like it was all that bad after all?
After 6 weeks of use it started to show signs of stress under load even moderate all cells were at 3.7v it would drop 0.3v lower - so it was a huge waste of time but I'll continue to test and publish exact results soon.
well dumb question: whats the life cycle of your battery banks?
+DESCENT great question ask me in two years :)
No man, it did not "filed"
Phew, thanks for reaching out and letting me know.
Please ask what this circuit is
What is a circut?
hello,
how do you keep your banks from not going over 4.2v?
thanks
Combination of good charge controller settings
interesting experiment!