Maybe use one with a PCM?
It can't run a starter motor but should be fine in a hybrid if that starts its engine on the hybrid battery.
EV-Power | LiFePO4 Battery Pack (12V/12Ah PCM)
Or maybe a slightly bigger one without PCM:
EV-Power | Lithium Battery LiFePO4 (12V/20Ah)
You can find scores of cheap batteries on Ebay and Alibaba etc, but frankly I'm scared to try those myself. In some cases the specs can't be right, like when the weight of the battery is less than it should be for the indicated Ah, or "LiFePO4" with 3.7 volts per cell...
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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