Grimracer Lipo battery swelling

[jetskier]

as what you can see from the pics.. does mine fall into the slight swell use at own risk or major swell toss it category. I apologize for dragging out this thread. just hate to toss an expensive battery if it still have some good life for recreational use.

[Brushless55]

First off you are not doing anything wrong with these packs..
second I have several packs that have a slight swell to them and never have an issue with them..
if they are not heating up they should be just fine..
I did have a Hayin pack "puff" on me after one of two runs in a PSpec boat under only about a 65amp load and that one I tossed!

[jetskier]

the battery still runs and charges normal to me, but I'm still fairly new to using lipo. I use about 2500-3500mAh that is what the charger reads when done and the performance to me seems to be the same. My Hyperion can't even reach 1C when charging these 4S batteries so there is no way that I am charging them over the limit. Looking at the pics of the amount that it swelled, would you guys use it if charged outside and/or in a flame proof bag?

[longballlumber]

Wow, I am really surprised to see this thread. My experience with the GrimRacer Batteries have been very positive. I’ve been running them exclusively since they came to the market, and I have yet to “puff” anything. I run mostly P-Limited stuff, but I also have a Q sport hydro also.
We did have a club member have some start to puff slightly, but we came to the conclusion that he had made some calculation errors in his effort to charge multiple packs at one time and was charging above the manufacturer’s recommendation of 1C.
Now, I have ran into a couple of instances where some cells in packs were “soft”, but after a couple of cycles on my Hyperion charger they were fine.

Are you seeing any voltage difference in the cells? In other words, do you have a bad cell? What about charge time, is it taking longer to charge/balance one battery over another?

Later,
Mike

[jetskier]

not good!!! for such an expensive battery, the warranty is only 90 days.

[jetskier]

Thanks, Ill try that.

I too had a 4s 1p Grim puff on me. Ran it in an all stock Revolt. I called AQ, took a picture and sent a copy of purchase, and they sent me back a replacement.

[3b3b]

I too had a 4s 1p Grim puff on me. Ran it in an all stock Revolt. I called AQ, took a picture and sent a copy of purchase, and they sent me back a replacement.

[siberianhusky]

No not being used, they were returned to the local hobby shop, one of the guys who had them puff is an employee, pretty sure they were replaced.
I'm positive that these packs were not abused, neither guy has a charger than can charge at much more than 1C.
Stock Aquacraft boats running the suggested Aquacraft batteries, don't really know what else to say, last year people were raving about them, the first four 2s packs I've seen run puffed almost right away in setups drawing less than 60 amps, Richard was even running his Eagletree Logger so we know what the amp draw was.....
Could have been a bad batch, they were purchased from the same shop within a week or two of each other.

[jetskier]

are you still using them? and what is the warranty regarding these batteries, they cost quite a few $$$. I've also always charge and set my charger @ 1C which is 4.2a and even lower on my charger about 3.9a that's all it can reach charging a 4S. BTW my charger is a Hyperion EOSO606i ac/dc so therefore I really don think I'm doing anything wrong or abusing these batteries.

Two different guys I run with have had 2s 5000mah Grimracers puff in bone stock UL-1s in the last month or so, never run down to LVC, properly charged, one with the stock plastic prop the other with the suggested lifter prop from AQ.
Neither set of batteries had more than a half dozen cycles. Think one set went after 2 runs!

[siberianhusky]

Two different guys I run with have had 2s 5000mah Grimracers puff in bone stock UL-1s in the last month or so, never run down to LVC, properly charged, one with the stock plastic prop the other with the suggested lifter prop from AQ.
Neither set of batteries had more than a half dozen cycles. Think one set went after 2 runs!

[jetskier]

I'm still fairly new to lipo, just wondering how bad is this. I got 4 Grimracer 4200 4S batteries at the beginning of spring and one of them is swelled up. I don't know how bad is the swelling and if I should use it or not. It's the 2nd one on the right. It's only once or twice been discharged on the Revolt to LVC, besides that its always discharged about 1/2 to 3/4 capacity. Also, the right one is looking a little swell but not as bad as #2
Thanks