Let me tell you my experiences in using the Samsung i7500 Galaxy.
While I used the 1.5 software i7500XXIJ1 battery lasted me 90 hours of normal use, and very little use of WLAN (I turned off everything that consumes the battery. Using 2G,).
Yesterday I upgraded to 1.6 PDA: i7500XXJC2, phone: i7500XXJB2, CSc. i7500TWOJC,
I immediately noticed that the software is bugged. USB bug (can not turn off the notification tone when connecting the charger), dialer tone bug (sound too low), it is impossible to log on Gmail account (Factory data reset needed second time).
Once charged my phone, I used it a couple of hours, occasional calls and messages.
Today, after 25 hours of up time, battery reading was 93%, after a few hours I had the occasional phone calls, and in the evening I surfed a little, market, google maps. I left my phone in two hours and the battery was at 70% and after 10 minutes at 63%. discharging very quickly. I am interested in whether you tried to check whith this code * # * # 4636 # * # * Check the temperature of the battery to me a moment was at 4.6