The trigger master would be useful if you want to lower your ROF, but with a 7.4v LiPo your ROF should be just perfect.
My advice is to get a MOSFET (increases your ROF a bit, eliminates arcing in your trigger, and increases battery life), and a wolfdragon PCB (protection circuit board, all it does is monitor the individual voltage of your lipo cells so they don't over-discharge)
A 1600mah 7.4v Lipo, mosfet and PCB take up about as much room as an 8.4v NIMH
Not sure about the dimensions of the larger LiPo's but they come in MANY sizes.
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