Sony Ericsson Xperia X10 :: Way To Increase Battery Life?

I just ordered the Xperia X10a. Customer Retentions gave me a great deal on it (Great deal = entirely 100% free, I figure I really couldn't beat "free" :P) and so I said "Yes, that sounds lovely" (not an exact transcript of my reaction). I now await its arrival in the mail. So I've been pretty damn excited about it. But then I did the ONE thing I told myself not to do: go trolling on the internet for all the negatives. I knew there were going to be negatives, that's the nature of smartphones, there's always going to be something if not multiple somethings. But I have to admit I was unprepared for the sheer amount of complaints over the battery life. Now I'm depressed (not really, but you know what I mean). Did I just order myself a lemon? I mean don't get me wrong, you still can't beat a free phone I suppose, but is it a free mobile phone, or a free "I need to get to a wall outlet so I can charge this thing because it discharged after only an hour and a half" phone, which isn't exactly all that mobile (ok, well it's mobile, just not mobile + useful at the same time -- I admit I was sort of hoping for the latter. Pipe dreams, what can I say).