Quote:
Originally Posted by Daox
My question to you is why even keep the lead acid starter battery? The lithium batteries can easily start your car. If you need to go on a long trip there is no reason why the alternator can't be switched on to maintain them. For the rest of your driving you can just run without the alternator and charge them when needed.
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This is correct, it could start your car. I don't think a car alternator would do for charging Lithium batteries. They require special charge conditions, and I think a higher charging voltage (not sure off the top of my head, I do not the charging cycle is not linear).
The lithium batteries CAN be discharged all the way if you like, it just makes them wear out faster. Its something you would have to weight out, size and cost of pack vs. expected life time.
I don't know your tech abilities, but building a pack can be troubles. Lithium batteries need to be protected during charging, discharge, and from short circuits. If you do not get these things right, you will ruin your cells.