I use a 20A 20mm x 5mm cylindrical fuse, but that still won't leave much room...
Before upgrading my P90TR i used a 8.4 1500mAh NiMH from airsoftatlanta.com (Atlanta Georgia, USA) and it was fine for all day use, I now use 7.4V 2000mAh 10C LiPO packs and get several thousand rounds per pack.
Just save yourself some headache/hassle and get a 8.4V 1400-1500mAh pack and you will be set.
Further headache reduction will be to replace your bearings with metal ones (remember 2 of the 6 with be oval/oblong in shape) and reshim your gears.
Those two modifications will keep your P90 running like a champ for as long as you own it... other upgrades beyond those are purely preference (and they really require the metal bushings and good shim job for reliability sake..)
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