Grimracer Lipo battery swelling

[tlandauer]

Rats! Just got back from running my Revolt and my 2s 5000mah 40C Grims just puffed. Temps came in at 112. And these were the replacements from AQ. Less than maybe 10 runs and over the warranty period.

That's too bad, I bought a pair and haven't used them yet, my Sky Lipo ( 4s, 5000mah) ran for two seasons w/o any problem, but HobbyPartz is always out of stock. I have since switched to Dinogy and they are holding up well.
I really don't know if I should use them, they will be the most dangerous paper weights, lol...

[bandanabob]

I also have a pair of 2s 5000 40C that are puffed. They charge ok and balance but I too am leery of using them. But have been without a problem...knock on wood...just don't run them close to LVC .

[jetskier]

Just used mine today. ran good/warm but I cut the my run time shorter the the rest. and charged good and balance, took in about 2300mAh and cool.

I also have a pair of 2s 5000 40C that are puffed. They charge ok and balance but I too am leery of using them. But have been without a problem...knock on wood...just don't run them close to LVC .

[detox]

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

Did you use 4s2p or 4s1p setup? My 4200 Grimracer packs are swollen also (six lap heat race LSH class).

A six lap heat race using 4s1p will certainly make one of these 4200 packs swell, heat up and slow down. I wonder if the 5000 versions do any better in a six lap heat race. I know the Hyperion 5000 work verygood. Been wanting to try the Neu 6000 packs.

[jetskier]

one battery 4200 30C 4s1p setup. no racing.

[3b3b]

That's too bad, I bought a pair and haven't used them yet, my Sky Lipo ( 4s, 5000mah) ran for two seasons w/o any problem, but HobbyPartz is always out of stock. I have since switched to Dinogy and they are holding up well.
I really don't know if I should use them, they will be the most dangerous paper weights, lol...

I'm 3 for 3 going bad with Grims. Not sure if it helps but my 4s was purchased from tower the first of June of last year and replacements prolly in August sent from tower as well. My zippies are holding up but with inconsistent balancing. Happy with my Gforce and Skylipos.

[3b3b]

2s packs balanced with no increase of heat. I might take a chance and run them with a cut off at 3.7

One thing I noticed on the puffed packs of the 2s and 4s... The runs seemed faster like it was on 5s. Is that an ok or bad sign?

[BILL OXIDEAN]

I sat up and Witnessed Brian Buass hit over 110 mph on 4s with those batteries, and he's not "easy" on equipment. I'd have to say they're worthy batteries, but I'm not the wizzard of Oz.
There may be some truth to what Jay said about a compromised batch, but my 2c is that I watched that man improve his speeds with those batteries. There are records on the books to prove it..

[madmikepags]

If an entire pack swells then it is "usually" user error, if only 1 cell in a pack swells then it is "usually" a defective cell and "should" be replace by any reputable manufacturer.

[Fluid]

...There may be some truth to what Jay said about a compromised batch, but my 2c is that I watched that man improve his speeds with those batteries. There are records on the books to prove it..

I watched too Wilmer. But if you read my post you will see that initial batches are almost always good to set a good rep for the product (Brian's records are examples) - it isn't until later that they begin to seed in poor items. Heck, even a blind hog can find an acorn in a pile of rocks....



.

[MarkF]

One of the main causes for a battery to puff prematurly is moisture getting into the packs during assembly. China has a lot of humidity and rain and I know they do there best to keep it out. Problem is sometimes it still gets into some of the packs and they don't really know when this happens. Cells are made to the magnitude of 100,000 to 200,00 peices a day in some factories. They can only test so many cells so bad ones do get through. I know when I get a bad pack they always apologize and replace it for me. It's true some factories change formulas because they find out they didn't charge enough to make a profit and it's to late to raise there price. HobbyKing has bankrupted more companys than you could imagine and there web site is banned throughout the entire country of China. This places company's who screwed up in a bad possition and sometimes forces them to make bad decisions. Another reason why you see good and bad post on the same cells is because the product inside the batteries they use are very unstable. This is the product made in China and is very cheap. The good stuff has to be imported in and that is why you have batteries that cost more and some that cost a lot less. The product inside the battery does vary from factory to factory. This of course implies the end user hasn't done anything wrong himself. I know when I run a pack to dead stick it usually starts to puff 4 or 5 cycles later. It's not something you see as soon as you mess it up. I think this leads people to belive they did nothing wrong because it doesn't happen at the time they hurt the pack.

Mark