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Old 09-03-2010, 03:54 PM   #1
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Default Lipo slight puff/swell

I have a few older hard lipos that have been running great. They balance fine and work fine. I ordered a few new ones and when I compared them I noticed the older ones have a very slight puff or rounded appearence vs the new.

I always balance charge....never run them too low..I only race one 5-7 minute race on a pack. I never recharge them more than once per day. Overall a pretty easy life on a battery.

They work great but just holding them side to side vs the new they have a more rounded appearance. I looked at the rest and noticed the swelling or rounded seems to be consistant with the age of the batteries. The oldest ones have the most rounded profile all the way up to the brand new ones that are perfectly flat.

I looked at a few of the batts from other guys at the track and have noticed the same thing...the newer batteries have scuffs from use on the edgesbut as they get older you see scuffs appearing in the midle of the battery as it starts to get the "rounded" profile. It seem to be the same on both hard and soft packs... regardless of brand...one guy said his soft packs were a tight fit when new (last year) and this year they are getting near impossible to get in.

I asked the LHS and they told me they were gonna go bad soon and that they must have been ran low or overheated......no way to either of those. I dont even like to leave them in my truck on race day without all the windows wide open. I am pretty frekin anal...I know guys who leave their stuff in their trucks all summer. I am too paranoid and always store my batteries indoors.

Is this normal????? anyone else notice this???? or am I just nuts
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Old 09-03-2010, 04:30 PM   #2
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Do you discharge them to around a half charge when finished for the day? If you leave them with too much of a charge they are more likely to puff up. Some seem to be more prone to this than others. Even when properly cared for though, this sort of thing can happen. Best to make sure they are left half charged until just before going racing. It should help minimize the likelyhood of this happening.
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Old 09-03-2010, 06:43 PM   #3
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Who manufactures the cells you are using?
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Old 09-03-2010, 07:12 PM   #4
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Quote:
Originally Posted by locked View Post
Do you discharge them to around a half charge when finished for the day? If you leave them with too much of a charge they are more likely to puff up. Some seem to be more prone to this than others. Even when properly cared for though, this sort of thing can happen. Best to make sure they are left half charged until just before going racing. It should help minimize the likelyhood of this happening.
agreed

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Originally Posted by Skiddins View Post
Who manufactures the cells you are using?
I don't think it's the manufacturer that matters. I think it's the lipo technology in general.
If you search these threads you will find issues that people have had with all the major manufacturer's on the market.
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Old 09-03-2010, 09:41 PM   #5
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I agree with locked. Its best if you leave them 50-70% charged. Especially when being used for long periods of times (months)
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