Just thought I'd share my experience with extending battery life on the Captivate in case it may help others. Admittedly, this isn't very scientific as the changes I made coincided with getting a replacement phone, but I'm pretty sure my changes have made a huge difference. I have four or five Pop3 e-mail accounts that I check regularly. I had set the check intervals as wide as possible to conserve battery life, although I didn't know just how much that may have been adding to the battery drain. I had purchased a spare battery and would have to change the battery half-way through the day to keep the phone alive. I was basically going through two fully charged batteries a day. Anyway, when I set the phone up this time (replacement phone due to random shut-downs), I set my e-mail up differently. I got a gmail account to check all my Pop3 accounts. Any new messages on those five accounts are brought into my gmail account and labelled with the appropriate account. This has many advantages, such as all messages being stored "in the cloud", no problems when it comes to changing phones, spam filtering, etc... Also, it means that I don't have to use the awful Android e-mail app. I was not even having good results with K-9. I just use the gmail app and any new messages are pushed through to the phone. However, the biggest difference seems to be battery life. I have gone from using two batteries per day, to the battery lasting well over a day. Yesterday, for example, I had the phone on all day with usual usage, and come bed-time last night, I was still on about 85-90%! Your results may vary, but I'm pretty sure that the e-mail changes I have made have made a massive difference to battery drain. Just thought I'd share in case it helps anybody else.