Lithium battery

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After sitting at the workshop for a couple of weeks and then trying to start the previous battery i had been using died, i tried to charge it back up but it started to get really hot and would not fully charge. I think it might have lost a cell.

I purchased a new lithium battery recently after talking with a couple of the guys and it arrived very quickly, it was only 0.8kg so super lightweight. Unfortunately after installing i found it was simply too small for my vehicle as it would not start it without adding in an additional jump start battery.
The Lithium battery i thought was 12ah which was close to what i was using before but found it was actually 4ah, also the CCA was 195 and it probably needs closer to 400 to start the car



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