Believe you have a 1230mAh, just like the Surround. So you are only going to get about 4.5 hours of screen on (what they call talk time) out of a charge. That's assuming with the screen on you are doing some browsing, playing games, watching video, or other things that consume large amounts of data. Screen on is the biggest battery drain.
Changing the battery sucks on a Surround, so I have several USB portable chargers (Digipower) and use them with a 12" USB cable. Can walk around the house with phone/charger in one hand. So never out of juice or reach. And yes, I would have preferred an OEM extended battery, like the Trophy, but too late for that now.
Sent from my HTC Surround using Board Express