Hey yall i've bought and tested the 2200mah battery from ebay (eforcity - white and have "3.7V Li-ion BATTERY PACK / FOR HTC TOUCH" written on it)
All I can say is that is complete bull
, its not 2200mah its the same size as the stock battery so no new back-cover needed or included.
I tested it, I looped an episode of south park on my stock battery (full brightness) and it lasted 4hrs 15min
The 2200mah one lasted 3hrs 30min so go figure, ah well it can still be used as a spare I guess, on the plus side the shipping was fast (5 days from order) and it was only $10 overall.