 Electric vehicles
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Mates
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Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
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Steve McConner wrote ... I can see the slogan now... Choose life, choose LiFe!  Mates, can you post details of the charger that you used and how it destroyed your pack?
So, the problem of the destroyed LiFePO4 industrial battery started when I switched my engine from 36V (500W) to 48V 1000W. Problem was that I owned 15AH 36V battery pack based on the multiple LiFe 26650 with internal balancers and suddenly I needed 48V. So I ordered 12V LiPO4 20AH and connected it in series with the pack to get 48V. For charging I used charger (4A 60V) which was enclosed to the 1000W 48V engine. Apparently this charger overcharged the industrial 12V battery (once I measured 18V!!! at the terminals) and probably that was the reason that this battery lost the capacity already after 3 months of hard work… Now I own 48V pack of 26650 with balancers and I run without any problems.
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Conundrum
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
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hmm. this is interesting, as i was under the impression LiFePO4 cells didn't degrade with overcharging.
i did come up with an interesting idea, wrap the 26650 cells or flat ones with the heat conducting gel from the backs of dead plasma screens in order to keep them cool.
Also it might be worth noting that totally discharging LiFePO4 when new (at least for the first 10-20 cycles) is an effective way to break them permanently. it appears the cells need to break in...
-A
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