Lipo repair

[lincpimp]

Took a quick look at your lipos just now Hardstyle.

Seems like one of the robbe lipos is a bit out of balance. The other seems ok. Did you fully charge.balance them before you sent them to me?

One of the maxamps lipos has a small amount of damage to it on the end. Otherwise they seem to be hold voltage reasonably well. What did you sue them in? Did they puff on you a bit under load?

[Hardstyle]

Originally Posted by lincpimp

Took a quick look at your lipos just now Hardstyle.

Seems like one of the robbe lipos is a bit out of balance. The other seems ok. Did you fully charge.balance them before you sent them to me?

One of the maxamps lipos has a small amount of damage to it on the end. Otherwise they seem to be hold voltage reasonably well. What did you sue them in? Did they puff on you a bit under load?

You said not to charge them before sending them so I didn't. I have stored them always fully charged and balanced. There's now about half years iirc from charging them.

Robbe lipos swelled quite much when I used them in my boat about 2 years ago. Haven't used them since, just charged them time to time.

Same thing twith MA lipos, both puffed. The other one which has electrical tape on it puffed more. And last time I test it it puffed again, but not so much was using it parallel 16000mah 11.1V

But thats odd you didn't notice anything else than miss balancing in the cells..

Try pressing that Ma lipo where's electrical tape, does it feel a little soft to you?

You can test drive them if you like or got time.

But if you can't find anything to fix with them you can sell them and split the moneys or something.. But I have seen my own eyes all of them puffing and only the MA lipos I have used in extreamely rare cases after that. Puffing I don't mean it has swelled to a balloon but so that it is noticeable..

Hope you get something from that

Edit:.
Puffing was the reason to move on A123 batterys, but now Im thinking trying lipos again, I think Im old enough and learned my lesson

[lincpimp]

Originally Posted by Hardstyle

You said not to charge them before sending them so I didn't. I have stored them always fully charged and balanced. There's now about half years iirc from charging them.

Robbe lipos swelled quite much when I used them in my boat about 2 years ago. Haven't used them since, just charged them time to time.

Same thing twith MA lipos, both puffed. The other one which has electrical tape on it puffed more. And last time I test it it puffed again, but not so much was using it parallel 16000mah 11.1V

But thats odd you didn't notice anything else than miss balancing in the cells..

Try pressing that Ma lipo where's electrical tape, does it feel a little soft to you?

You can test drive them if you like or got time.

But if you can't find anything to fix with them you can sell them and split the moneys or something.. But I have seen my own eyes all of them puffing and only the MA lipos I have used in extreamely rare cases after that. Puffing I don't mean it has swelled to a balloon but so that it is noticeable..

Hope you get something from that

Edit:.
Puffing was the reason to move on A123 batterys, but now Im thinking trying lipos again, I think Im old enough and learned my lesson

Ok, I will put a load on the MA packs, those usually have a bad cell or 2 that cause the puffing. I figured as much, but wanted to hear your experience. Guess I get to remove the shrink and test the cell pairs individually. Sounds like fun, huh...

This is why I dislike packs with paralleled cells. Unless they are all exactly matched, you generally end up with problems. And maxamps matching process (or their quality control while building the cells) is lacking... Alot of people have these problems.

I am not familiar with the robbe packs, but seeing that they are 12c packs, and 4200mah they are really only good for around 50 amps cont. What kind of boat were you running them in? Size, power system, prop, etc.