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You'd need the proper equipment to test, however what I do is just safely assume the motor (on a stock gun) would never ever draw more than 15A continuously.
I've got an M249 shooting 1300rpm at 400fps, and it doesn't draw more than 18A
For 9$ you can get a 7.4v 1600mah LiPo that's good to 32A continuous draw, that's more than any gun should require.
Anyway, hook up a fuse in the system incase your gun ever did try to exceed the LiPo's limit, obviously if you have a 24A LiPo, you'd want a 20A fuse, etc
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