SAFELY Reviving an over-discharged Ryobi 18v battery

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I see a lot of folks sharing potentially dangerous advice on reviving deeply discharged tool batteries. Here's a much safer way to do it.
TL;DR if you don't want to watch the whole video:
- Charge the pack at 300mA max up to 15-6V while monitoring for safety
- Check that each cell is balanced at around 3v each (give up if not)
- Let rest overnight in a safe place
- Check that the cells held their voltage and balance (give up if not)
- Charge at 300mA up to full (21V) while monitoring for safety
- Check that the cells are in balance at around 4.15v (give up if not)
- Let rest overnight in a safe place
- Check that the cells held their voltage and balance (give up if not)
- Perform a couple full speed discharge and charge cycles in a safe area
- Check their balance again
- After all that, I generally consider it safe to use normally
- Try it AT YOUR OWN RISK, batteries can be very dangerous!
UPDATE: This battery did in fact end up fully recovering and is happily powering tools again.
I've enjoyed doing electronics tinkering for many years now and decided to try recording some of what I do and sharing it for fun. My own lower quality ‪@bigclivedotcom‬ knock-off. (Go check out his channel if you love electronics stuff).
This is very early on in me trying to record stuff at the worktable and I know a lot of it isn't great - yet! I edited tons out because I ended up rambling and repeating myself a bunch. I need more practice, but I'll get better.
If anyone has helpful advice to improve as I eventually share more videos, please feel free to comment. I'm not committing to any schedule or anything, just sharing as I go and hopefully, I'll improve the setup and editing along the way.
Some of the tools I use: (nothing sponsored/affiliated)
Filmed on an Android Revvl 4+
Bench Power Supply: Ruideng DPS5005 rdtech.aliexpr...
Hot Air Gun: Yihua 8858
Clamp Multimeter: UNI-T UT210D
Battery Charger: XTAR VC4SL
Adjustable CC Load: MakerHawk Electronic Load Tester 150W
3D Printer: Creality CR-10S
Soldering Iron: Weller WLC100 40W

Опубликовано:

16 сен 2024

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Комментарии : 10

@jrmiller034 27 дней назад

Great job explaining and I agree with all your information. I have been successfully reviving these batteries also.

@gd.ritter 21 день назад

It's really satisfying to be able to fix what someone else thought was just trash.

@aortiz826 Месяц назад

Very informative video. Have some Dewalt batteries that won't charge, my question is do Dewalt batteries have the same principal or are they different?.

@gd.ritter Месяц назад

@@aortiz826 any tool battery that markets as 18v or 20v is the same basic concept, 5 batteries in series. Some tools put the protection and monitoring circuit board in the tool itself instead of battery so where everything is installed can vary. But the process to check and revive the battery pack is essentially the same.

@allenrandall8419 5 дней назад

i should not have to fix this. royobi should fix this or Home depot discontinue

@gd.ritter 5 дней назад

All batteries will self discharge if you leave them sitting for a long period of time. This isn't a short-coming or poor design of the Ryobi battery pack, it's misuse by the owner. To clarify, ALL lithium based batteries are capable of having this fault if stored or used wrong, that includes all other power tool brands.

@williamdemars8675 Месяц назад

I have a 6ah with 18v+ at the terminals, yet it will not charge or power a tool. What can I do?

@gd.ritter Месяц назад

My first guess would be that they are out of balance and one of the cell pairs is dead/damaged. If you have a dead cell in there, it'll kill the cell(s) in parallel with it and the protection circuit will cut off the total pack output when it sees any one cell is below the safe minimum. So you're seeing 18v and that might be 4 fully charged cells plus a tiny charge in the 5th but the brains won't let you run a tool because of that one bad cell. 6Ah is probably 2 sets of 5 batteries in parallel (5S2P). If you open it up and check the voltage of each pair, I bet one of those pairs is totally useless. In that case, if the other cells are all good and have plenty of capacity left, you could replace just the bad cells. (Doing this will be a future video of mine ASAP. I'm ordering a batch of new cells this month to build a few packs.) Or if the other cells are old and past their prime, you can also just replace them all and have it run like new for a tiny fraction of the cost.

@williamdemars8675 Месяц назад

I wish it were so simple. All 5 pair are balanced to 4.09 and holding for over a week.

@gd.ritter Месяц назад

@@williamdemars8675 ok, then that indicates an issue with the circuit board of some type. I'd check for any obviously blown fuses, resistors, tracks, or capacitors you can find (there a many different versions of their 18v PCB). Worst case scenario if you can't identify the issue but know the cells are good, get a different battery with bad cells and do a brain or cell transplant for a zero cost fix.