what about LiFe bats?.. slightly lower voltage than Lipo 1cell =3.3v 2S=6.6v 3S=9.9v. Alot safer than Lipo as you can fully discharge without puffing the packs, and can take more than 1C charge rate.
only downside is u need a charger that is life capable, but most lipo chargers nowadays have life capabilities as well.
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