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The other threads discussing aluminum-air batteries and other range extension options got me thinking.. could you build it yourself? For example, could you build a battery pack that you carry around in your front and then charge from it using an inverter?

If I did my math right, using 2 deep cycle marine batteries would only give you 2kwh of power, so the trick would be building a pack that was ridiculously large/heavy/expensive.

Anyway.. fun thought exercise.