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I know some top fuel boat racers that use motorcycle batteries for their 500 cid blown V8s, but they all use magnetos for ignition and have no other electrical drains other than a solenoid for the air shifter, telemetry gear and the tachometer.
You might look into an Optima battery. They are expensive racing cells, but are half the size of a similarly powerful battery and can be mounted anywhere, even upside down.
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