Great to know how to bypass the BMS in a case like this. The average consumer would likely have junked it and bought a new battery pack from Ryobi. In this case, I would imagine it highly unlikely that any dangerous conditions like dendrite formation in the cells, could have occured. However, I would assume the Ryobi design engineers have to limit their liability as there would likely be no reasonable way to have the BMS detect the age of the pack and decide whether to charge a 0V pack or not. But as consumers, we can make that call as you did. I had to revive a 0V pack recently too and also bypassed the BMS to do it.
Holy shit this worked!!! I had two Craftsman 19.2v LithIon battery packs that were DEAD!!! This actually revived them enough for the charger to work! Thank you for this.
I bought a single Torx 10 Security bit from my local auto supply dealer for about $4 which you will need to undo the screws. There is also a screw hidden under a small rubber plug on top that you need to pry out with a needle or awl and yoru good to go .
I have the same problem with my 2 Ryobi batteries - I had been charging them every few months but stopped after a 2 month stay in hospital (heart operation that led to sepsis, luckily I survived). Last time I went to use it they were both dead flat. I know about the direct charge trick but don't have anything else at 18V DC so need to find an 18V battery for cheap money to do this but haven't come across any on the times I've looked. I don't really need another 18V battery except for this so don't want to spend much. I think I may resort to building a pack from other battteries but something I'll use but annoyed because I threw out 2 e bike 36V battery packs that I could have butchered for this purpose a couple of years ago after the bike was stolen (with no batteries as they'd been removed for charging). Seeing this has revived my interest - I think I'll try connecting the third battery terminal directly to the battery main terminal first. By any chance could you please check if it reads +ve or -ve for me? Many thanks!
If they are at zero, first start with a car battery, then start it up and get 13+... then try to charge them normally. You don't need a full 18v to bring them back from the dead to where the BMS will recognize it as a working cell.
I bought six 9ah packs in 2019 for my ebike, along with the "Supercharger". I used it to charge them once, then I disassembled the Ryobi packs, dumped their BMSes, hooked them up with no BMS and bulk charged them. No BMS is a bit sketchy, but I checked cell group voltage regularly, which was always happy because they used the Sony VTC6 cells (which self-balance pretty well). Knowing they used those cells was actually why I bought them. Pretty expensive in a certain sense (C$450 with tax for ~648Wh, or almost C$700/kWh), but I didn't need more than a soldering iron to get rolling, and I knew it had nice cells. I had initially hoped to keep the Ryobi packs intact so I could use the Supercharger for charging, but the BMS -- and me not knowing I could use a diode to series them -- put the kibosh on that. The packs got warm on my usual ride to the weed store, around 50km round trip, but they had the range even with a 9C motor and 26A Xie Chang controller, in hilly Ottawa, and with my fat speed-demon self on board. A couple months later, I got a sweetheart deal on a Golden Motor dual-motor bike with a Headway 40152S 16s pack, which supplanted the Ryobis. So they sit on a shelf, lonely, with only an occasional discharge/charge cycle to keep them happy...
Sony VTC6 cells are one of the best cells. I don't think Ryobi uses these cells any more. They use cheap Chinese cells now. Even Kobalt who used to have Samsung and Sanyo cells now they turn to cheap Chinese after market cells. If it looks orange inside that Kobalt 24V battery, you get after-market cells.
@@vuaeco Well, 25km there and 25km back. This is a vagary of living on the line between two jurisdictions: Prices, especially on highly taxed goods, can vary wildly. That was when Ottawa only had 3 private weed stores for a city of a million which gouged like crazy compared to the Quebec government-owned weed store across the river. Now, there's a weed store on every block! Of course, being in California, I'm sure you have no clue about weed stores on every block... 🌬️💨
@@fun_ghoul Well, it's been legal here since 2016. But every block? Maybe only in Canada. I guess you can now walk to the weed store instead of using your bike. :D
Jump start worked well for you, be careful when bypassing the bms, if you have 1 bad cell then you can cause harm by uneven voltage across multiple cells,, maybe try jump start on each individual cell , good video, keep making more please
Kool way to revive a Ryobi battery using another battery. Is it possible to repair a battery that went shorty in the water while drilling a hole in a 2x8 board in a dam?
is there a way you could just drill a probe needle size hole somewhere on the 2 sides and then do the charge fix that way without needing to open the entire Ryobi battery? if you could show us exactly the right spot on the outside places with a marker, I think we could carefully drill small hole in the plastic? and then do this fix or is this not really possible?
Haha ooh man are you one of the people that believes everything you see on the internet?? I actually just stumbled on that video your referring too. Being the comments are disabled, that should be a good dead giveaway for anyone without a little knowledge of Electronics’s come on man I went to it just read the comments😂 if it was a lithium battery which it is he was very very close to exposing it to air which will not be a good day for him. That’s all I’m gonna say.
The BMS is programmed (there is a microcontroller on that board) no, actually it is ONLY powered by the Lithium cells. They use blocking transistors to stop normal charging if the batteries are fully dead. In otherwords, the BMS is working 24/7, but mostly in sleep mode. Hope that makes sense. I program devices like this. (just never programmed a bms but this is my best guess).
I strongly suggest you heed the advice of Rick Summerfield in these comments (namely, measure each cell group and charge them individually), as well as limiting the amount of current you use; that recycling centre should have a crapload of old cell phone chargers, which make decent lower-current single-cell chargers (until they crap out). 10A is gonna be too much for some old cells! You might also do this outdoors, in case you have a more exciting day than you planned for! 🔥
Will this work with the 18V one+ batteries. Older ones that were sold as system years ago that are a yellow mustard color. Don’t think they’re lithium? I did something similar to this with a car battery, that wouldn’t charge, with another donor battery hack a while back. I forgot how I did it, found it online and it worked. Something about fooling the charger to charge the dead battery and bring it back to life…
I think mine might have something else wrong with it :( I tried doing this with two identical Ryobi 18v 4ah batteries. Voltage on the dead one at the BMS terminals used to just read 0. After charging it directly the voltage bounces around for a second between 2-5 volts then slowly drops to 00.1 volts. Volts on the direct battery terminals (bad battery) measure 18.0 volts and the current measures 4.6 amps. My source good battery started off at 20 volts. I discharged it to 18 volts, recharged it and used it again. It's now at 19 volts. I suppose I can keep trying until they are at equilibrium but I feel like from watching this video it shouldn't take so much time to juice the batteries up enough to get the BMS to figure out the cells are fine and let it charge normally.
I have several batteries with the same issue. Batteries test fine and hold voltage. Terminals don't show voltage won't charge or run tools. I found replacement circuit boards online and am going to try that.
Hey man, just wanna say i love your videos, I am learning so much from them! I have a question for you. I have a 10ah dewalt battery that won't charge. It was a brand new battery and never worked. Dewalt sent me a new one, but I still have this and I am trying to revive it. I have opened it up and tried to jump start it like in this video, but I am not sure if the Dewalt battery functions the same as the Ryobi. I connect the + and - terminals from another 20v dewalt, and when connected the voltmeter shows 20v, but as soon as i disconnect the voltage drops to 6-7v immediately, then half second later it is down to 3v. I have never been able to get it to above 3v for more than 1 second, even leaving it connected to another dewalt battery for over an hr. Any idea what i can do to try charge this as a pack? I am almost at the point that I want to tear it down and try charge the individual cells in my xtar battery charger. Thanks!
I revived a dead battery a couple of times using this method. It gets it going again and works fine, but I have to keep it on the charger or it will die again in a few days. Is there a trick to stop the phantom drain?
I take it that 10 cells means you have LG (I forget the model designation) 1500mAh cells, which are rated for 30A continuous. Can you see the wrappers at all? I think they might be like lavender in colour...
These are wrapped in blue shrink wrap. Ryobi is cheap on this model. They use after-market cells, made in China. They are probably only 20A continuous each (maybe even less) because they are 2 cells in parallel.
I Have A Ryobi Battery & The Testlight Didn't Work So I Took It Apart & Blew Out All The Dust. & It Worked For A While & It Quit Working. So I Might Have To Take It Apart Again. So What Could Be The Issue? Could It Be A Loose Solder Connection? Or Could It Be The Switch It's Self?
I have owned Dewalt, Milwaukee, Kobalt, and Bosch. Only Ryobi batteries have this problem. Wonder why you always see Ryobi batteries (and rarely a Dewalt or Milwaukee) at the battery recycling bins at Lowe's and Home Depot? They are in there for a reason.
@@vuaeco wow. just fucking wow man. I had no idea and I'm a life long pro-electronics tech and c programmer.. You tube continues to amaze me with content like yours. Subscribed.
They want you to toss it out and buy a new one. Smart chargers ain't really smart. Same happens with other batteries or even newer car chargers that wont charge your battery if it's voltage is too low.
You're exactly right. I have a couple of different car chargers that are computerized and will not revive my car battery that's been sitting for months. Created my own using an 12v transformer and a bridge rectifier. After a couple of hours on that, it was up enough that the computer charger would take over and do the rest.
This method sends far to much current through those cells. When first connected it reads 27 Amps! That 's enough to damage the cells you are trying to recharge. If you use a power supply with current limiting, you'd be much better off. (I can hear you now..."Not everybody has a power supply." I realize this. But sending huge amounts of current to dead cells is still a bad idea.) Another thing that would be smart to do is to check the voltage of each cell in the "5S" string... to verify they are balanced with each other. E.G. - 3.50V, 3.52V, 3.51V, 3.54V, 3.49V is reasonably well balanced. Then, recheck when fully charged, as the "top balance" can be different than the discharged balance. (The "top balance" is more important.) Last comment - this manual charging solution doesn't solve the BMS issue on some units. You'll need to RESET the BMS to clear the error flag. There are several other videos that can explain how to do this, but essentially you just short the 3.3V power going to the microcontroller to ground.
Doesn't a battery or battery pack take so much charge current as wants itself? It will self regulate the current as long as the voltages are within reason.
snap in the battery and get the same results I have a Ry-obi battery and it charge full . put battery run my weed eater it will run 2 minutes and dies recharge use it again the same results . need to drain the battery how do I do that only have weed eater --------------------------------------------------------- Full-charged = 14.65 stop at 14.05 open battery tested at 15.13 pole at 14.65 Each-Cells read 5] [ 3.05 ] 4][ 3.01] 3][ 3.04] 2][ 3.00] 1][ 3.01]
Milwaukee, Ryobi and HD's Ridgid brand are all of the same manufacture (TTI). If you look at the BMS board, Vu, you will see markings to attach different terminals for those two others.
![I.N "HALLUCINATION" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/n5B5q1Hwt_U/mqdefault.jpg)
Great to know how to bypass the BMS in a case like this. The average consumer would likely have junked it and bought a new battery pack from Ryobi. In this case, I would imagine it highly unlikely that any dangerous conditions like dendrite formation in the cells, could have occured. However, I would assume the Ryobi design engineers have to limit their liability as there would likely be no reasonable way to have the BMS detect the age of the pack and decide whether to charge a 0V pack or not. But as consumers, we can make that call as you did. I had to revive a 0V pack recently too and also bypassed the BMS to do it.
Holy shit this worked!!! I had two Craftsman 19.2v LithIon battery packs that were DEAD!!! This actually revived them enough for the charger to work! Thank you for this.
I bought a single Torx 10 Security bit from my local auto supply dealer for about $4 which you will need to undo the screws. There is also a screw hidden under a small rubber plug on top that you need to pry out with a needle or awl and yoru good to go .
I have the same problem with my 2 Ryobi batteries - I had been charging them every few months but stopped after a 2 month stay in hospital (heart operation that led to sepsis, luckily I survived). Last time I went to use it they were both dead flat. I know about the direct charge trick but don't have anything else at 18V DC so need to find an 18V battery for cheap money to do this but haven't come across any on the times I've looked. I don't really need another 18V battery except for this so don't want to spend much. I think I may resort to building a pack from other battteries but something I'll use but annoyed because I threw out 2 e bike 36V battery packs that I could have butchered for this purpose a couple of years ago after the bike was stolen (with no batteries as they'd been removed for charging). Seeing this has revived my interest - I think I'll try connecting the third battery terminal directly to the battery main terminal first. By any chance could you please check if it reads +ve or -ve for me? Many thanks!
If they are at zero, first start with a car battery, then start it up and get 13+... then try to charge them normally. You don't need a full 18v to bring them back from the dead to where the BMS will recognize it as a working cell.
THIS SHOULD SAVE A LOT OF MONEY! THANKS
Severely underrated channel.
Worked on one, melted down number 2, supervise if using a car battery charger or possible fire.
I bought six 9ah packs in 2019 for my ebike, along with the "Supercharger". I used it to charge them once, then I disassembled the Ryobi packs, dumped their BMSes, hooked them up with no BMS and bulk charged them. No BMS is a bit sketchy, but I checked cell group voltage regularly, which was always happy because they used the Sony VTC6 cells (which self-balance pretty well). Knowing they used those cells was actually why I bought them.
Pretty expensive in a certain sense (C$450 with tax for ~648Wh, or almost C$700/kWh), but I didn't need more than a soldering iron to get rolling, and I knew it had nice cells. I had initially hoped to keep the Ryobi packs intact so I could use the Supercharger for charging, but the BMS -- and me not knowing I could use a diode to series them -- put the kibosh on that. The packs got warm on my usual ride to the weed store, around 50km round trip, but they had the range even with a 9C motor and 26A Xie Chang controller, in hilly Ottawa, and with my fat speed-demon self on board.
A couple months later, I got a sweetheart deal on a Golden Motor dual-motor bike with a Headway 40152S 16s pack, which supplanted the Ryobis. So they sit on a shelf, lonely, with only an occasional discharge/charge cycle to keep them happy...
Sony VTC6 cells are one of the best cells. I don't think Ryobi uses these cells any more. They use cheap Chinese cells now. Even Kobalt who used to have Samsung and Sanyo cells now they turn to cheap Chinese after market cells. If it looks orange inside that Kobalt 24V battery, you get after-market cells.
"Ride 50Km to the weed store"! :D
@@vuaeco Well, 25km there and 25km back. This is a vagary of living on the line between two jurisdictions: Prices, especially on highly taxed goods, can vary wildly. That was when Ottawa only had 3 private weed stores for a city of a million which gouged like crazy compared to the Quebec government-owned weed store across the river. Now, there's a weed store on every block!
Of course, being in California, I'm sure you have no clue about weed stores on every block... 🌬️💨
@@fun_ghoul Well, it's been legal here since 2016. But every block? Maybe only in Canada. I guess you can now walk to the weed store instead of using your bike. :D
@@vuaeco I haven't smoked weed in 4 months. I can't afford it anymore.
I have about six battery’s I’m gonna do that with. Thank u!!!!!
Please see -- and heed! - the comment by Rick Summerfield, as well as my reply to chuck stark. Fire bad! 🚫🔥 🚨
Jump start worked well for you, be careful when bypassing the bms, if you have 1 bad cell then you can cause harm by uneven voltage across multiple cells,, maybe try jump start on each individual cell , good video, keep making more please
Having one bad cell is less likely with an unused battery, but still good general advice.
EDIT: Very good advice, actually. 👍
@@fun_ghoul😅u
Kool way to revive a Ryobi battery using another battery. Is it possible to repair a battery that went shorty in the water while drilling a hole in a 2x8 board in a dam?
is there a way you could just drill a probe needle size hole somewhere on the 2 sides and then do the charge fix that way without needing to open the entire Ryobi battery? if you could show us exactly the right spot on the outside places with a marker, I think we could carefully drill small hole in the plastic? and then do this fix or is this not really possible?
Haha ooh man are you one of the people that believes everything you see on the internet?? I actually just stumbled on that video your referring too. Being the comments are disabled, that should be a good dead giveaway for anyone without a little knowledge of Electronics’s come on man I went to it just read the comments😂 if it was a lithium battery which it is he was very very close to exposing it to air which will not be a good day for him. That’s all I’m gonna say.
Great idea, but... I wouldn't trust those holes as far as I could throw the battery. Unless there's a map online to say exactly where.
After jumping the Ryobi Battery and charging with the Ryobi charger -- what has changed with BMS to allow normal charging ?
The BMS is programmed (there is a microcontroller on that board) no, actually it is ONLY powered by the Lithium cells. They use blocking transistors to stop normal charging if the batteries are fully dead. In otherwords, the BMS is working 24/7, but mostly in sleep mode. Hope that makes sense. I program devices like this. (just never programmed a bms but this is my best guess).
Gonna try this with a bunch of Black & Decker 18v batteries I got free from the local electronic recycle.
I strongly suggest you heed the advice of Rick Summerfield in these comments (namely, measure each cell group and charge them individually), as well as limiting the amount of current you use; that recycling centre should have a crapload of old cell phone chargers, which make decent lower-current single-cell chargers (until they crap out). 10A is gonna be too much for some old cells! You might also do this outdoors, in case you have a more exciting day than you planned for! 🔥
Will this work with the 18V one+ batteries. Older ones that were sold as system years ago that are a yellow mustard color. Don’t think they’re lithium? I did something similar to this with a car battery, that wouldn’t charge, with another donor battery hack a while back. I forgot how I did it, found it online and it worked. Something about fooling the charger to charge the dead battery and bring it back to life…
Thanks for sharing this great info.
I think mine might have something else wrong with it :( I tried doing this with two identical Ryobi 18v 4ah batteries. Voltage on the dead one at the BMS terminals used to just read 0. After charging it directly the voltage bounces around for a second between 2-5 volts then slowly drops to 00.1 volts. Volts on the direct battery terminals (bad battery) measure 18.0 volts and the current measures 4.6 amps. My source good battery started off at 20 volts. I discharged it to 18 volts, recharged it and used it again. It's now at 19 volts. I suppose I can keep trying until they are at equilibrium but I feel like from watching this video it shouldn't take so much time to juice the batteries up enough to get the BMS to figure out the cells are fine and let it charge normally.
I have several batteries with the same issue. Batteries test fine and hold voltage. Terminals don't show voltage won't charge or run tools.
I found replacement circuit boards online and am going to try that.
HELLO SIR I NEED HELP FROM YOU WHICH TYPE OF BATTERY ARE USED IN ( yashica mg 2) CAMARA PLEASE CAN YOU TELL ME
Hey man, just wanna say i love your videos, I am learning so much from them! I have a question for you. I have a 10ah dewalt battery that won't charge. It was a brand new battery and never worked. Dewalt sent me a new one, but I still have this and I am trying to revive it. I have opened it up and tried to jump start it like in this video, but I am not sure if the Dewalt battery functions the same as the Ryobi. I connect the + and - terminals from another 20v dewalt, and when connected the voltmeter shows 20v, but as soon as i disconnect the voltage drops to 6-7v immediately, then half second later it is down to 3v. I have never been able to get it to above 3v for more than 1 second, even leaving it connected to another dewalt battery for over an hr. Any idea what i can do to try charge this as a pack? I am almost at the point that I want to tear it down and try charge the individual cells in my xtar battery charger. Thanks!
I revived a dead battery a couple of times using this method. It gets it going again and works fine, but I have to keep it on the charger or it will die again in a few days. Is there a trick to stop the phantom drain?
I take it that 10 cells means you have LG (I forget the model designation) 1500mAh cells, which are rated for 30A continuous. Can you see the wrappers at all? I think they might be like lavender in colour...
These are wrapped in blue shrink wrap. Ryobi is cheap on this model. They use after-market cells, made in China. They are probably only 20A continuous each (maybe even less) because they are 2 cells in parallel.
@@vuaeco ha. Where are non-after-market cells made?:
How long was it in storage for it to completely drain?
He said "years", but it likely doesn't even take as long as that. My fellow DeWalt DCA1820 owners know what I'm talking about! 💩
I Have A Ryobi Battery & The Testlight
Didn't Work So I Took It Apart &
Blew Out All The Dust. & It Worked For A While & It Quit Working.
So I Might Have To Take It Apart Again. So What Could Be The Issue?
Could It Be A Loose Solder Connection? Or Could It Be
The Switch It's Self?
could be your batteries are just dead. They die a shit death.
I love it! I wonder if all BMS behave similar?
I have owned Dewalt, Milwaukee, Kobalt, and Bosch. Only Ryobi batteries have this problem. Wonder why you always see Ryobi batteries (and rarely a Dewalt or Milwaukee) at the battery recycling bins at Lowe's and Home Depot? They are in there for a reason.
@@vuaeco wow. just fucking wow man. I had no idea and I'm a life long pro-electronics tech and c programmer.. You tube continues to amaze me with content like yours. Subscribed.
How do I find a BMS seller??
And Ryobi refuses to stand behind their batteries.
I bought 2 batteries and they were both bad.
They would not cover them.
They want you to toss it out and buy a new one. Smart chargers ain't really smart. Same happens with other batteries or even newer car chargers that wont charge your battery if it's voltage is too low.
Spending is a way to stimulate the economy.
You're exactly right. I have a couple of different car chargers that are computerized and will not revive my car battery that's been sitting for months. Created my own using an 12v transformer and a bridge rectifier. After a couple of hours on that, it was up enough that the computer charger would take over and do the rest.
@@vuaeco hahahaha!
This should be illegal, just like BMS's that shut down after a certain amount of cycles.
manufacturers know were "jump starting". packs so they prevented it by putting measures in the name of "safety" of course.
They want you to buy new, 20 volt black and decker you only have to jump it for a second, you don't have to take them apart.
This method sends far to much current through those cells. When first connected it reads 27 Amps! That 's enough to damage the cells you are trying to recharge. If you use a power supply with current limiting, you'd be much better off.
(I can hear you now..."Not everybody has a power supply." I realize this. But sending huge amounts of current to dead cells is still a bad idea.)
Another thing that would be smart to do is to check the voltage of each cell in the "5S" string... to verify they are balanced with each other. E.G. - 3.50V, 3.52V, 3.51V, 3.54V, 3.49V is reasonably well balanced. Then, recheck when fully charged, as the "top balance" can be different than the discharged balance. (The "top balance" is more important.)
Last comment - this manual charging solution doesn't solve the BMS issue on some units. You'll need to RESET the BMS to clear the error flag. There are several other videos that can explain how to do this, but essentially you just short the 3.3V power going to the microcontroller to ground.
Doesn't a battery or battery pack take so much charge current as wants itself? It will self regulate the current as long as the voltages are within reason.
snap in the battery and get the same results
I have a Ry-obi battery and it charge full . put battery run my weed eater
it will run 2 minutes and dies recharge use it again the same results .
need to drain the battery how do I do that only have weed eater
---------------------------------------------------------
Full-charged = 14.65 stop at 14.05
open battery tested at 15.13 pole at 14.65
Each-Cells read
5] [ 3.05 ]
4][ 3.01]
3][ 3.04]
2][ 3.00]
1][ 3.01]
That's what happens you buy a cheap battery. Go with the best well-known, then you don't get screwed (Dewalt or Milwaukee). Good video, my friend.
Yep, low quality cells and sketchy BMS is how Ryobi rolls now.
Milwaukee, Ryobi and HD's Ridgid brand are all of the same manufacture (TTI). If you look at the BMS board, Vu, you will see markings to attach different terminals for those two others.
@@fun_ghoul But yet somehow this only happens to Ryobi batteries. I wonder why? :D
@@vuaeco Do you have a shelf full of brand new Milwaukee and Ridgid batteries from several years ago?
@@fun_ghoul LOL, no, I don't. Maybe some day when I'm rich enough to buy Home Depot. :D
..........37 watts?????
I get what you're saying 18v X 2 amps=36 watts.
You have an Asian accent.
So what?????????????????????
so what???????????????
???????!!!!!!!