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Neither of your options.
8.4v 2400mAh would be my suggestion.
But if you ONLY have those two options available, personally, I would suggest the 8.4v 2000mAh. It can crank the M120 fine and your piston, gears and motor will last longer.
Two conflicting answers. Both personal opinions.
Use the benefits and cons given, and decide for yourself.
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