The 'aero' you're referring to is probably the Air Hogs "Aero Ace" and it's a biplane, not a helicopter.
It runs on a 130mah Lipo battery and you can actually buy the batteries themselves from IndoorFlyer (they're based in the UK, but shipping is actually very reasonable to the US):
http://www.indoorflyer.co.uk/index.a...&productid=117
Myself, I had previously bought a 5pack bundle of 160mah Lipos that I wanted use on my Bits/ZZs, but they turned out to be too big...But they're actually PERFECT for the Micro-T!