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I'm building a parallel high voltage hybrid pack for my Insight, and if that is either working well or failed so I can reuse the cells, I would like to replace the ailing 12V lead battery.
I would use a top balancing BMS, of course. But I would also add a big diode and a NTC regulated charge limiter; the colder, the lower the charging current would be.
Finally I would indeed place the battery as low as possible, preferably at the bottom of a deep watertight box to protect it from splashes and flooding, with terminals on the top of it (at the same level as the current battery top).
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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 Gigameter or 0.13 Megamile.
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For education go to people unlike yourself.
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