I have been playing with some very nice 7.4 and 11.1 volt lipos, and doing a lot of reading of what other folks have found...and it seems that is sorta depends on you motor, as it allows your motor to truly operate at 100%. So it depends on your particular motor (lots of differant behaviour depending on type and brand) and with your particular mechbox innards. If your mechbox parts isnt up to snuff, and fully energized motor will break them.
A stock unused team spare kraken ran a 11.1v lipo recently for 4000 rounds during a recent game, and then required just new bushings (plastic to metal..duh). It also got a shim and regrease, but that is assumed anytime I open a mechbox.
A lightly used stock kraken recently ran a 7.4v lipo for about the same amount with no problems (yet).
A older dboys AKSU 11.1v lipo ran ok recently, so perhaps the innards match the capabilities of the motor better and perhaps has metal bushings (It was not my AEG)....time will tell.
At minimum I would suggest having metal bushings if you don't already have it, and a willingness to upgrade anything else that breaks.
edit:whoops...lots of posts got in before mine.
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