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Re:Ohm (YC S15) is a smarter, lighter car battery that works... by maxerickson on Wednesday August 12, 2015 @04:51PM (#10050527)
You can buy Lithium ion jump starters on Amazon today:

http://www.cnet.com/news/pocket-sized-jump-starters/

(linking the review because I don't know which brands are reasonable...)

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