We use 7.2V batteries here as examples for discussion. The 3700mah GP pack is so strong that when it is fully charged its effective voltage output is very close to 8.88v. The Intellect 5000mah pack is even stronger.
Size-wise, a very close alternative to 7.2V nimh is 7.4V Lipo. Lipo is less heavier and far more powerful. A good 7.4V lipo can easily achieve 9V+ when fully charged. Still, it is safe for the ESC’s BEC circuit.
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