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1500 mah will barely turn a 400fps spring unless there is some seriously upgraded wiring inside the mech box. Hook up a large battery (8.4 V will do) but go at least 2000 mah if you want any type of duration out of it. I have an 8.4V 4200 mah bat running my 400 fps AEG and it almost runs like it on a 9.6 because of the "surplus" mah.
SHA DO
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