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I've seen 12V lithium polymer (LiPo or LiFePO4) (same as the Porsche batterry) under $500 before. That porsche battery is the similar size of RC LiPo battery packs but I'm not sure why they charge so much, perhaps the "gold crest" allow them to.... iono!?!
There's a lot RC people use their LiPo battery to jump start cars, youtube it!
BTW, there are two types of lithium battery people use for high discharge current, LMO and LiFePO4. All powertool and e-bike maker use LMO batteries but for car and motorbike, they should all use LiFePO4. Supposely LiFePO4 (A123 battery company) claim it can operate anywhere human are active.... something like -50degF (don't quote me on that).
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