His problem is that the 9.6v does not have enough current to drive the gun. It is unsuitable. The 8.4v battery is delivering the current and supplying the motor the necessary current to fully compress the spring prior to releasing it.
It's "possible" that the charger is not properly charging the battery, but it's more likely that the battery is simply too small. But to be sure, you should specify the sizes of your batteries, voltage is only 1 component of size, the other is the current rating expressed in milli-amp hours, or mah.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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