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I powered my HEQ5 with a 3 cell LiPoly from Hobby King. It was about 12.5v off the charger and I'd rarely end up running it much below 12v - it worked very well and was much lighter, less affected by cold and the voltage didn't drop as much as lead acid. Not sure how many amps the mount needed (maybe 2?) but it was well within what the lithium batteries could supply when needed. Those 18650's are in everything - computers, all my cordless tools, flashlights, power banks and even the first generation (or two?) of the Tesla electric cars. Amazing what we can 3D print these days.
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