Here are two reviews that mention battery life. Perhaps if you find on either site reviews of phones that you're familiar with that give their battery lives that will provide a good relative reference.

Samsung Omnia SCH-i910 (Verizon Wireless) - Full Review - Reviews by PC Magazine

Samsung Omnia SGH-i900 Rated at 13 hours?! Same reviewers rate Samsung Epix 907 at 9 hours 14 min

Benchmark Test Results
Continuous talk time: 12 hours 11 minutes
Spb Benchmark Index: 472.52
CPU index: 1798.55
File system index: 194.35
Graphics index: 5591.47

Samsung Epix SGH-i907

Benchmark Test Results
Continuous talk time: 9 hours 14 minutes
SPB Benchmark: 637.26
CPU index: 2146.39
File system index: 270.16
Graphics index: 4850.08