yes the general rule of thumb is to not discharge them below 80% although several guys in the States on Rcgroups discharge them down to 3.0V which is close to 100% and apparently they haven't had any longevity issues. This is with a very low % of capacity current I'm guessing.
The 8Ah one should be able to deliver 3600x8x0.8/320 = 72 seconds of 320A
Although it wont live at 320A for long and may heat up and burst if used for too long at that sort of current. Starting a car should only take 5 sec max so it should be fine, unless the car asks for more current than 320A.
p.s. - Lipo only overheat if over discharged by a high current. I killed a few, one 850mah, with a low current of 3A all the way down to 0.0V with no drama, no heating at all.
Last edited by Goran; 16th October 2014 at 01:47 PM.
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16th October 2014, 01:39 PM
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