The lead acid battery was invented 1859 - its an old technology, its not even very good, its heavy and its poisonous - but so far there is no real alternative to the lead acid battery and thats a real shame. A truly new and reliable battery technology is desperately needed. It is the missing link in what would be the (true) green revolution, but the revolution is put on hold despite many many many promises of breakthroughs in battery technology. It looks like the lead acid battery is staying with us for years to come. Lithium batteries are good, they really are - but they are expensive and resent news tells that it will stay that way for now. Lithium batteries has another drawback - they need a charge controller pr. cell - in an electric car that means several hundred print-boards. Overcharge a lithium battery and you have a nasty firework.
As stated in this blogpost there is a way to go for the generic open hardware lead acid charge controller.
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