i haven't put the battery in yet. but i doubt it's much heavier. at work, my phone sits by the speakers it's hooked up to. so i'm rarely handling it throughout the day. yes, it's bigger,obviously. i expected it to be. but honestly, like i said, the cingular 8525 is huge. i remember when i first got it,i was like "this thing is a brick!." but if you use something like that for over 2 years, you get so accustomed to it. i never had a razor,or any kind of slimline phone. so what everyone else considers huge, i consider normal. by the way, i'll let ya all know if it catches fire tomorrow,lol.