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9.6V batteries tend to cause either the tappet plate to snap earlier (due to increased impact from the faster gear spin caused by the higher voltage), or tearing the ass end off the piston. I've fixed a good dozen AEGs over the years that had premature damage done to them from use of a 9.6V battery. Mind you, they were all upgraded springs which is much harder on the piston teeth due to less sponginess of the spring to absorb the initial impact of the gears on the piston teeth. Tappet damage doesn't matter what spring is used.
My experience and opinion as well, mix with the above guys (Defcon I trust for gun work) opinions and experince that you'll be fine, and draw your own conclusions based upon possible risk/no risk to your internals. Might be fine, might have to replace parts once in awhile that wouldn't be required with an 8.4V.
BTW, I own three 8.4V batteries, and have zero interest in a 9.6V. And I rarely have issues with my guns going T.U. on me from shooting.
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