Killed a lipo, need help

[Cheetah928]

Hey RCT! I took the trx-4 out with a 2s lipo and it somehow let it go all the way down to 6.8 volts. Heres the story: after I let it sit for some time, I plugged it into the charger to store it, and it wouldn't charge. Got the adapters out and plugged it into the RDX1, and did some readings. That's when I figured out it was all the way down at 6.83v. Since it's Traxxas, couldnt see what the individual cells were at, but it should be similar considering I always balance charge it. Battery is about 2.5 years old, and its a 5800 MAH. anyone have a solution to revive it?

Thanks!

 

[Finesavageboy2]

https://www.rctalk.com/forum/threads/can-this-dead-lipo-battery-be-salvaged.141988/
I’ve never really messed with reviving a lipo, but I have with nimh. especially with a traxxas id battery… I think this thread should help but if not come back and maybe some other people will chime in and share their knowledge.

 

[Cheetah928]

I've seen the thing where you put it on nimh for a bit to revive, but I don't want to create a fire hazard. I have adapters for it to plug into the RDX1. I can override the balance wires and put it on a really low amp lipo charge. I just don't know the safety of that either.

 

[DavidB1126]

6.8 divided by 2 is 3.4v/cell. You're fine assuming if both cells are balanced. I'm pretty sure Traxxas sells a adapter to charge them on non Traxxas chargers so I'd just use your hitec to balance charge if you get that adapter. Also I'd like to see IRs if that charger has a setting on there

3.4v per is what usually low voltage cutoff is in the ESC so you should be safe. Once you go under 3.0v per cell the voltage drops really quick.

 

[Finesavageboy2]

I looked on the internet and saw you can see the voltage of each cell it’s a regular Multimeter!
Heres the video
Yeah like David said above you just divide the voltage by 2 (since you have two cells) and it’ll give a rough estimate of what they should be.

 

[majin]

oof i can relate SO hard to this lol. what kind of charger are you using? can you set it to nimh and maybe bring it back, I've had one succeed and 2 fail so i guess it depends on the battery and how dead it is

 

[RetroThutmose]

6.8 isnt that bad I thought?

 

[Cranberry Juice]

6.8 isn't bad, but from my experience Traxxas chargers are overly cautious on voltage limit. Get an adapter and charge it on a non-Traxxas charger and you should be fine.

 

[floe]

3.4V per cell is absolutely fine.

 

[CertifiedMike]

I was ALL excited to see pics of fire and melty madness!
You're at storage voltage.
Charge at will!

 

[xjtorc]

set charger to 6 amps and send it!

 

[DavidB1126]

set charger to 20 amps and send it!

Fixed

 

[xjtorc]

Fixed

daily reminder of why this forum is so great

 

[nino]

3.4 is fine, a little low for my liking. But still, any charger should start charging, unless one cell is below 3 or so.

Even cells dumped to ~1V can be revived (low current NiMH mode until it gets to a voltage where a lipo program works).

 

[Cheetah928]

oof i can relate SO hard to this lol. what kind of charger are you using? can you set it to nimh and maybe bring it back, I've had one succeed and 2 fail so i guess it depends on the battery and how dead it is

It's a I'd traxxas one, but I have an rdx1 mini. I can plug it into the charger, and even without balance wires, I can override it to where it doesn't require them. I can charge it enough to where the traxxas charger can finish it off on a balance.

 

[RustyUs]

Hey RCT! I took the trx-4 out with a 2s lipo and it somehow let it go all the way down to 6.8 volts. Heres the story: after I let it sit for some time, I plugged it into the charger to store it, and it wouldn't charge. Got the adapters out and plugged it into the RDX1, and did some readings. That's when I figured out it was all the way down at 6.83v. Since it's Traxxas, couldnt see what the individual cells were at, but it should be similar considering I always balance charge it. Battery is about 2.5 years old, and its a 5800 MAH. anyone have a solution to revive it?

Thanks!

What do you mean you couldn't see the voltage of the cells because of it being a Traxxas battery?

 

[Finesavageboy2]

the traxxas ID batteries only don’t have the balance port like other batteries. It is built in to the actual battery plug in and you can only use traxxas chargers on them. This was kinda hard to explain so bare with me…

 

[DavidB1126]

View attachment 234718

the traxxas ID batteries only don’t have the balance port like other batteries

That adapter above would help you.

 

[Cheetah928]

What do you mean you couldn't see the voltage of the cells because of it being a Traxxas battery?

The individual cell voltage. I can see the total, but not the individual

 

[Finesavageboy2]

Do you have a multimeter? If you do I linked above a video on how to see the individual ones…
Or just divide the total voltage by 2