The term Endothermic is used because the Nicad cells actually absorb heat during the first 80% (approx) of the charging process. There would be heat generated by the charging process which would be absorbed, so the overall effect is not to get colder but to stay roughly flat. In practice I believe it rises a small amount, but nothing like the 100% exothermic NiMH. You'd have to look into the actual chemistry involved to know the finer details.
Dave, the Delta peak charging principle is only working a currents above ~C/5 which you didn't mention in your video. If you charge with lets say C/10, you wont get a stabile delta peak to detect.
Can you please make a video providing some guidelines (best practices) as to how to charge and discharge Ni-MH batteries so we can get the most life out of them?
it'd be great if you could talk about the lithium batteries too ! the R/C crowd use them a lot but I'm not sure they understand how they work all that much but they are the best power source for anything mobile/portable and high-power
Found a source for my interest at last! Just one question, why aren't you a school teacher? By far more interesting and enjoyable! Thanks for the videos!
This takes me back! I used to spend a lot of time battery testing back in the 1990's when I was involved with racing a battery conversion of a Porsche 914. We used to completely baffle people by fast charging Optima YelloTop AGM lead acid batteries at up to 5C. When you're pumping in hundreds of amps and initially the voltage is DROPPING, you get a lot of people really confused. That included John Olson, the electrochemist who deveoped the battery! From later research, it seemed the high charge rates were changing the plate structure and lowering the internal resistance. The temperature increase whilst charging would decrease over a number of cycles. Other researchers found that cycle life could actually be increased by (carefully monitored & controlled) fast charging.
I had a charger that used a short to ground to pulse the current. All the clocks in the house would not keep time, and when I put a scope on the mains the frequency (& volts) would fluctuate. Finally I tracked it down to this pile of junk phone battery charger. Unplug it and it stops, Plug it back in and it starts back up. Using a digital camera as a poorman's storage scope/tracer I use a lot of AAs. Monster Cable (your favorite company) makes a great charger. I have good NiMh AAs from 1999.
I have two NiMH battery packs for my Neato robot vacuum. 4/3A x 6 , 7.2V, 4000mAH. Based on voltage drop during discharging at various currents I believe the pack resistance is 0.5 ohms. I am using a Turnigy Reaktor smart charger. I would like to run 3 x Charge Discharge cycle. Please suggest what the charging current, deltaV, discharge current, discharge voltage should be set to. When I put the batteries back into the Neato Ive been getting a battery error. At this point I'd like to avoid buying a new set.
Can you charge a Ni-CD battery on a NI-MH charger? The cells and amps are in range,and i read this charger would,but it’s not charging,and saying the NICD are full. The charger gets fire hot charging just a Ni MH bat! Thank you for your time!
@ EEVblog I have opened my Philips QC5050 trimmer today and I found battery AA Ni-Cd type. Can I fit that type of battery on my trimmer? Is that fine with the tool and charger? The charger is 1.3V, 9W and 1500 mAh. Cheers!
I have two questions, hopefully some1 with more information will answer them. I have a Ni-cad battery pack. 1. My 12v batteries measure 14.4 volt when they are fully charged... why? 2. I'm using them a few times a month, 4-5 times per month. Can I keep them in my drill fully charged? (ready for use when I need it) I charge them fully when they are empty(0.9-1.0 V / Cell) and put them back in my drill to sit for a few days (up to 7) ready to be used again.
+Zoltán Béres a charged 12V car battery will also measure 14+. Also, if you were to measure the battery voltage while under load, it would be 12 or less.
14.4 is too high. They are being overcharged. Fully charged NiMH batteries should be 1.35 volts per cell. So your battery should be 13.5 instead of 14.4
+EEVblog Hello Sir, I am currently doing a project where I am trying to analyze different brands of rechargeable NiMH batteries. I was thinking of building a circuit to recharge the batteries but could I just take a apart an already built NiMH recharger? Are there terminals in the charger that I can take measurements from? Thank You
Question. What is the minimum voltage needed to get ni cd drill battery to get it charging. Each battery is normally labelled 1.2v. I want to replace some of the 'dead' single batteries to get the drill battery charged and working. Thank you.
Thank you Dave! I remembered your more recent video on charging a LiPo/LiIon battery using a LAB power supply. I have a set of NiMH batteries I urgently need charged but the charger broke. LAB power supply + your videos to the rescue :) Of course I'm closely monitoring everything but so far so good 😊
Gday Dave, I want to use my adjustable lab supply to trickle charge my 4x nimh’s at 0.05C in series, adjusting the current is pretty straightforward, my question is what should I set the lab supply voltage to? 1.4v or something around that? Thanks.
Great presentation, you have a great way of teaching! Thanks for the free education, I wish some of my profs in college had half the presentations skills that you do.
I was reading I can chargue the batteries at 1 C with the Delta Temp / Delta time, but this reduces the lifetime of the battery in general terms, this is true?
I bought a XTAR MC2 USB multi battery charger (14500, 18650 etc. and its input is 5V 1A. I bought a Eveready rechargeable battery thats 1.2V and 1300 mAh and its been charging from 3pm upto 12:30am. My question is, is this safe? the XTAR MC2 has a full charge cutoff but still waiting for that green light. Is it safe to full charge it the first time? does it take really that long? its not getting hot during charge btw. I tried my chinese 3.7 18650's which is close to full and it did fully charged.
I was charging my Airsoft's battery which is rated at 8.4V 1200mAh with a stupid charger that doesn't stop charging or doesn't offer any overcharging protection. It just lowers voltage from 220V to match the battery. After watching this vid I thought I should measure the battery with a multimeter and got back 10.2V!! from the battery? wtf? Does temperature have to do anything? Battery is still hot from charging. Should I let it cool down and take another measurement? Faulty multimeter?
I need to charge a fa-bp it’s a pack of 4 batteries, 4.8v can I just use an old nimh charger, it’s not the end of the world if I wreck or blow them up. Can I do this.?
I have an old craftsman nicd charger but there is ac current coming from the output!!! What is up with that? How can ac be used to charge nicd batteries? But I also see a number of diodes on the pcb making me think there is dc output as well. I am really confused! How can this work for charging batteries?
I think all these charge methods rely on rise of temperature. when you heat a battery its resistance drops and so voltage will also drop if current is high. unfortunately it works only when you fast charge, if current is low these methods are worthless. and may damage battery if not time limited
I have a clansman radio battery (24v 4ah), I know i got to charge is 10% of the amp hour rating, so 0.4amp, but what would the voltage be for a slow charge? its a nickel metal hydride battery. I also have a small 12v 0.6ah battery for a smaller radio so a 0.06amp but again what voltage?
Hi, can anyone tell me if there is a charge / discharge cycle to raise the Volts of my Ni-MH batteries as much as possible? even at the cost of decreasing the life of cells
Always remember guys if you have an ebay account and find that after your weight in grams and capacity tests are bad, you can DEMAND A FULL REFUND AND REPORT THE SUPPLIER to ebay Like I have done over the past 6 years. I give ebay proof by photos and readings of what I have found wrong with the batteries. They have a 100% full refund policy. You have nothing to lose. Ebay management will eject the supplier from ebay permanently!!
@@dlarge6502 You can charge at higher voltages. 1.5v per cell (in series) is great. You will see voltages such as 1.2v (1-cell), 2.4v (2-cells, charge at 3v), 3.6v (3-cells, charge at 4.5v), etc. Yes 1.2v per cell will work, but it will take waaaaaaaay longer. The cutoff discharge voltage should be around 1v, at which it's considered "discharged". Best to use cheap universal battery chargers such as IMAX B6 or other single cell chargers such as the Mboxer, which will select the safest voltage/amperage automatically.
Hi Dave, I know its an older video perhaps you can still help, I made a 12V battery from AA ni-mh 1200mAh 1.2, how do I go about charging the pack with my cheap lap power supply ?
NiMH has more capacity and is more tolerant over reverse cell voltage that can happen on overdischarged packs. All the rest is disavantage compared to NiCds.
*interesting points ,if anyone else trying to find out how to recondition used car batteries try Panlarko Recondition Planner ( **lovy.biz/zrsy** ) ? Ive heard some super things about it and my m8 got great results with it.*
I do. In an RC airplane with electronics from 20years ago. When NiCds do the job I see no reason to switch to lithium-based batteries. They are dangerous to the point they cannot be charged unattended. I charge NiCds overnight with a trickle (cheap) charger and they are as safe to my house as my WiFi router while I'm posting this.
NiMH is as safe as NiCds, with more capacity. But while NiCds can be beat to death and still work, NiMH needs a really good (expensive) charger employing all the techniques he is describing on the video. With a dumb charger they last only a few cycles.
Considering that there are only about 43 million Australians I would totally be willing to have my tax dollars pay to move them all to the U.S., Canada and England for a few years to get rid of that up-inflection that is so pronounced. No offense to anyone, I just wish you could here it from my perspective. It seems like you are REALLY, REALLY fucking exited about batteries in this tutorial, for example. And every little point you are making is REALLY, REALLY fucking important. lol Again, no offense I only wish you could here it with my ears, then you would understand why so many non-Aussies complain so much. On the same note though, if it's not annoying in your country then by all means, continue. I will just have to learn to tolerate it.
This video oozes with the classic pioneer-age charm of RUclips. I may be forgiven for missing that time a little.
Yep befor the commies took over. All good things must end I guess
Damn! if he is my professor in college then I'm will not miss every single classes. His voice is so convincing like on TV ads 😁
The term Endothermic is used because the Nicad cells actually absorb heat during the first 80% (approx) of the charging process.
There would be heat generated by the charging process which would be absorbed, so the overall effect is not to get colder but to stay roughly flat. In practice I believe it rises a small amount, but nothing like the 100% exothermic NiMH.
You'd have to look into the actual chemistry involved to know the finer details.
Excellent, thank you very much
Lol 2009 what a time back when this place was still the shit without all the monetization and woke cancer. Bonus points for potato cam.
I miss the old YT so much...
What in the blank blank are you talking about? Come down from your high and make a decent comment. Good luck to you.
Oh i love it when I go to youtube for help with something electrical and I see this bloke on the thumbnail. Great vid mate.
These are apparently some very, VERY exciting concepts!!!
Old, but super useful video, especially, while servicing older battery equipement, with NiCd batteries.
PoorHootz Did you ever see the video where Dave talks about how he made the spinning into? Kinda of funny.
Dave, the Delta peak charging principle is only working a currents above ~C/5 which you didn't mention in your video. If you charge with lets say C/10, you wont get a stabile delta peak to detect.
Can you please make a video providing some guidelines (best practices) as to how to charge and discharge Ni-MH batteries so we can get the most life out of them?
Thanks, this was a greatly informative video, it seems that there are many different opinions of battery charging, especially in the RC hobby.
Very useful info. I was looking on how to know when to stop charging my airsoft battery.
thanks for the explanation, now i know why you can charge Liion with NIMH charger but with risks...
Beautifully explained. Thank you.
it'd be great if you could talk about the lithium batteries too !
the R/C crowd use them a lot but I'm not sure they understand how they work all that much but they are the best power source for anything mobile/portable and high-power
Just watched the video and learned what i needed, thanks after 9 years
Well explained and clear... thank you!
i know it's kinda off topic but do anyone know of a good website to watch new series online?
@Jaxtyn Allan try FlixZone. You can find it by googling :)
@Karsyn Mack yea, I've been using Flixzone for years myself :D
@Karsyn Mack Thank you, signed up and it seems like they got a lot of movies there =) I appreciate it!!
@Jaxtyn Allan No problem :D
Excellent. Thanks so much.
Love the way you're so enthusiastic :)
EYE DID KNOT NO THAT...
Thanks! 👍😎⭐
Just came across you video. Was looking for more of a how to rather than an theory explanation. Nice info just the same. Cheers
I like how he sounds sarcastic the whole lesson lol
Found a source for my interest at last! Just one question, why aren't you a school teacher? By far more interesting and enjoyable! Thanks for the videos!
This takes me back! I used to spend a lot of time battery testing back in the 1990's when I was involved with racing a battery conversion of a Porsche 914. We used to completely baffle people by fast charging Optima YelloTop AGM lead acid batteries at up to 5C. When you're pumping in hundreds of amps and initially the voltage is DROPPING, you get a lot of people really confused. That included John Olson, the electrochemist who deveoped the battery! From later research, it seemed the high charge rates were changing the plate structure and lowering the internal resistance. The temperature increase whilst charging would decrease over a number of cycles. Other researchers found that cycle life could actually be increased by (carefully monitored & controlled) fast charging.
Excellent explanation!
This man hasn't age at all, like.... at all
Hi, I have a question regarding NiCd and NiMH battery charging characteristic. May I know why does the voltage drop when it has reached max voltage?
I had a charger that used a short to ground to pulse the current. All the clocks in the house would not keep time, and when I put a scope on the mains the frequency (& volts) would fluctuate. Finally I tracked it down to this pile of junk phone battery charger. Unplug it and it stops, Plug it back in and it starts back up. Using a digital camera as a poorman's storage scope/tracer I use a lot of AAs. Monster Cable (your favorite company) makes a great charger. I have good NiMh AAs from 1999.
exactly the information i needed thanks.
I have two NiMH battery packs for my Neato robot vacuum. 4/3A x 6 , 7.2V, 4000mAH. Based on voltage drop during discharging at various currents I believe the pack resistance is 0.5 ohms. I am using a Turnigy Reaktor smart charger. I would like to run 3 x Charge Discharge cycle. Please suggest what the charging current, deltaV, discharge current, discharge voltage should be set to. When I put the batteries back into the Neato Ive been getting a battery error. At this point I'd like to avoid buying a new set.
How do I charge my NIMH for best performance in mini 4wd racing, hot charging or ambient temp charging?
@EEVblog so I assume eBay sellers who list 'NiMH' batteries as Ni-CD are setting buyers up for a dangerous situation?
Can you charge a Ni-CD battery on a NI-MH charger? The cells and amps are in range,and i read this charger would,but it’s not charging,and saying the NICD are full.
The charger gets fire hot charging just a Ni MH bat! Thank you for your time!
Would have been good to tell us the temps to look out for. I use NiMH in a pack for RC planes. Cheers
Very Nice! Thank you!
@
EEVblog I have opened my Philips QC5050 trimmer today and I found battery AA Ni-Cd type. Can I fit that type of battery on my trimmer? Is that fine with the tool and charger? The charger is 1.3V, 9W and 1500 mAh. Cheers!
Good explanation thanks heaps!
I have two questions, hopefully some1 with more information will answer them. I have a Ni-cad battery pack.
1. My 12v batteries measure 14.4 volt when they are fully charged... why?
2. I'm using them a few times a month, 4-5 times per month. Can I keep them in my drill fully charged? (ready for use when I need it) I charge them fully when they are empty(0.9-1.0 V / Cell) and put them back in my drill to sit for a few days (up to 7) ready to be used again.
Thank you very much for the reply
+Zoltán Béres a charged 12V car battery will also measure 14+. Also, if you were to measure the battery voltage while under load, it would be 12 or less.
Zoltán Béres 12 v nimh
14.4 is too high. They are being overcharged. Fully charged NiMH batteries should be 1.35 volts per cell. So your battery should be 13.5 instead of 14.4
hi martin, can i ask you something?
Can use Lead acid charger to charge Nimh battery?
+EEVblog
Hello Sir,
I am currently doing a project where I am trying to analyze different brands of rechargeable NiMH batteries. I was thinking of building a circuit to recharge the batteries but could I just take a apart an already built NiMH recharger? Are there terminals in the charger that I can take measurements from?
Thank You
I wonder how many times people ask him to sing Last Train To Clarksville?
Question. What is the minimum voltage needed to get ni cd drill battery to get it charging. Each battery is normally labelled 1.2v.
I want to replace some of the 'dead' single batteries to get the drill battery charged and working. Thank you.
Thank you Dave! I remembered your more recent video on charging a LiPo/LiIon battery using a LAB power supply. I have a set of NiMH batteries I urgently need charged but the charger broke. LAB power supply + your videos to the rescue :)
Of course I'm closely monitoring everything but so far so good 😊
@NosferatuD Yeah, I started out thinking I had to be all "prim and proper" in front of the camera, and not my usual opinionated me!
You've got some really good videos. What observations would you have on LiPO?
How long of a charge time does a 2000Amh NIMH battery need, in term of hours?
Gday Dave, I want to use my adjustable lab supply to trickle charge my 4x nimh’s at 0.05C in series, adjusting the current is pretty straightforward, my question is what should I set the lab supply voltage to? 1.4v or something around that?
Thanks.
What is difference between fast and slow battery charging?
What are the advantages over each?
Chandimal Fernando fast charging your battery does not last that long over time. Slow charge, your battery will have prolong life in time.
Chandimal Fernando remotes
Great presentation, you have a great way of teaching! Thanks for the free education, I wish some of my profs in college had half the presentations skills that you do.
can i only use one of them to reduce the cost of my circuit
Really good, thanks for the information!
Hi, I am a student and I have a project includes Ni-Cd battery. Do Ni-Cd serial connected batteries need cell balancing like Li-Ion?
But why it is not charged with constant voltage but with constant current?
Czy zakonczenie ladowadowania NiMH Eneloop wczesniej niz wynika z wykresu ma jakis negatywny wplyw na akumulatory? Czy powoduje efekt leniwej baterii?
I want a video which explain Ni-MH function
Hello there. How do I measure the capacity of each of these batteries? I think it's done with a charge discharge. What is your method? (for Nİ CD)
I was reading I can chargue the batteries at 1 C with the Delta Temp / Delta time, but this reduces the lifetime of the battery in general terms, this is true?
OK, there are dark energy, black holes and blackbody radiation. But what about black current?
I bought a XTAR MC2 USB multi battery charger (14500, 18650 etc. and its input is 5V 1A. I bought a Eveready rechargeable battery thats 1.2V and 1300 mAh and its been charging from 3pm upto 12:30am. My question is, is this safe? the XTAR MC2 has a full charge cutoff but still waiting for that green light. Is it safe to full charge it the first time? does it take really that long? its not getting hot during charge btw. I tried my chinese 3.7 18650's which is close to full and it did fully charged.
I was charging my Airsoft's battery which is rated at 8.4V 1200mAh with a stupid charger that doesn't stop charging or doesn't offer any overcharging protection. It just lowers voltage from 220V to match the battery. After watching this vid I thought I should measure the battery with a multimeter and got back 10.2V!! from the battery? wtf? Does temperature have to do anything? Battery is still hot from charging. Should I let it cool down and take another measurement? Faulty multimeter?
How to know if a battery is nicd, nimh or lithium cell, when they have no markings?
measure voltage and capacity.
Hallo
Can I Ni-Mh parallel connecting,? Which method use
just wanted to know if you can charge ni-mh with a ni-cd charger?
Are you sure that's the charge curve for NiCd? Looks more like NiZn.
hi Dave, i'm firman from Indonesia. can i ask something about NiCd battery? Do you know SoC and DoD standards for NiCd?battery?
I need to charge a fa-bp it’s a pack of 4 batteries, 4.8v can I just use an old nimh charger, it’s not the end of the world if I wreck or blow them up. Can I do this.?
very interesting
@USparatroopersurgeon i have on too. i use your same charger and it works for me
I have an old craftsman nicd charger but there is ac current coming from the output!!! What is up with that? How can ac be used to charge nicd batteries? But I also see a number of diodes on the pcb making me think there is dc output as well. I am really confused!
How can this work for charging batteries?
The diodes will take care of it. They will somehow filter the AC and allow/convert to DC. I have newer 3v Craftsman drills which do that.
But how does the charger measure the temperature of the battery? Does it have a sensor/thermistor touching the battery?
SirArghPirate ozmosis
I think all these charge methods rely on rise of temperature.
when you heat a battery its resistance drops and so voltage will also drop if current is high.
unfortunately it works only when you fast charge, if current is low these methods are worthless. and may damage battery if not time limited
I have a clansman radio battery (24v 4ah), I know i got to charge is 10% of the amp hour rating, so 0.4amp, but what would the voltage be for a slow charge? its a nickel metal hydride battery. I also have a small 12v 0.6ah battery for a smaller radio so a 0.06amp but again what voltage?
The voltage of the battery
Hi, can anyone tell me if there is a charge / discharge cycle to raise the Volts of my Ni-MH batteries as much as possible?
even at the cost of decreasing the life of cells
Putting them in series or using a Step-Up module
If my science teacher was this enthusiastic I wouldnt have dropped out of high school hahaha
Always remember guys if you have an ebay account and find that after your weight in grams and capacity tests are bad, you can DEMAND A FULL REFUND AND REPORT THE SUPPLIER to ebay Like I have done over the past 6 years. I give ebay proof by photos and readings of what I have found wrong with the batteries. They have a 100% full refund policy. You have nothing to lose. Ebay management will eject the supplier from ebay permanently!!
Sir how much voltage needed to charge 1.2v Ni-Mh cells. Plz reply.
1.2v
@@dlarge6502 You can charge at higher voltages. 1.5v per cell (in series) is great. You will see voltages such as 1.2v (1-cell), 2.4v (2-cells, charge at 3v), 3.6v (3-cells, charge at 4.5v), etc. Yes 1.2v per cell will work, but it will take waaaaaaaay longer. The cutoff discharge voltage should be around 1v, at which it's considered "discharged". Best to use cheap universal battery chargers such as IMAX B6 or other single cell chargers such as the Mboxer, which will select the safest voltage/amperage automatically.
can i use them for my emergency phone charger
Ado Gamer weather radio
Can you charge NiMH batteries with a NiCad charger?
You shouldn’t. A Nicd charger can over charge a Nimh battery.
Yes you can, but its not optimal
No
Hi Dave, I know its an older video perhaps you can still help, I made a 12V battery from AA ni-mh 1200mAh 1.2, how do I go about charging the pack with my cheap lap power supply ?
Opinionated you is probably more better. You get to say as much as you need.
Who on earth would pay my ransom? :->
Me
wth is 1C
Kidnappers will extort money from audiophoolery industry companies for NOT returning you :)
Could you do one for lead acid battery charging?
What is C meant here?
Ni-Cd no power!; Ni-Mi Power )
or Li-Po a bomb or LiFe safe
NiMH has more capacity and is more tolerant over reverse cell voltage that can happen on overdischarged packs. All the rest is disavantage compared to NiCds.
i forgot why im here and i focused on how many times he said "ummmmm" and "chhaaaa jaaaa!" but i lost count .....dam it
Wow this video is really old is a decade old
*interesting points ,if anyone else trying to find out how to recondition used car batteries try Panlarko Recondition Planner ( **lovy.biz/zrsy** ) ? Ive heard some super things about it and my m8 got great results with it.*
Who actually uses *Ni*-*CD* batteries in *2017*?
NiCds are still widely used in the aircraft industry....Tried and tested!
Who actually comments that on a 8yr old video
I do. In an RC airplane with electronics from 20years ago. When NiCds do the job I see no reason to switch to lithium-based batteries. They are dangerous to the point they cannot be charged unattended. I charge NiCds overnight with a trickle (cheap) charger and they are as safe to my house as my WiFi router while I'm posting this.
NiMH is as safe as NiCds, with more capacity. But while NiCds can be beat to death and still work, NiMH needs a really good (expensive) charger employing all the techniques he is describing on the video. With a dumb charger they last only a few cycles.
hi Andre, i'm firman from Indonesia. can i ask something about NiCd battery? Do you know SoC and DoD standards for NiCd?
Considering that there are only about 43 million Australians I would totally be willing to have my tax dollars pay to move them all to the U.S., Canada and England for a few years to get rid of that up-inflection that is so pronounced.
No offense to anyone, I just wish you could here it from my perspective. It seems like you are REALLY, REALLY fucking exited about batteries in this tutorial, for example. And every little point you are making is REALLY, REALLY fucking important. lol
Again, no offense I only wish you could here it with my ears, then you would understand why so many non-Aussies complain so much.
On the same note though, if it's not annoying in your country then by all means, continue. I will just have to learn to tolerate it.