I don't use anything other then the phone itself, no speaker phone just normal handset.. I was pretty shocked myself I got that long out of the charge.. The only other things I can attribute it to is the way I have Chronos shutting down WIFI and Bluetooth when it's not needed and turning them on when I do need them.. Other then that, Keeping an eye on apps that wreck havoc on the battery, the latest Facebook incarnations ALL eat the battery up, so I am using 1.2 I don't care that they say it is fixed, it's not I lost 8% battery life this morning and the phone was in a wake state for an hour after I installed the latest version, and the phone was sleeping. I don't have anything else running in the background that is not needed other then Mail Polling, weather polling, and Gmail.. Everything else is staying stock.. The only other thing I can attribute it to, is the FULLY charged batteries when they are put in. The built in Charger charges the battery to full then stops, when the battery drops below a certain point the charger turns back on. If you don't catch the charger right as the light turns green the battery will be anywhere from 90 to 100% charged, thus when I would take the phone off the charger in the AM within a half hour I would already be down to 90% That 10% charge means a lot especially during sleeping time with the phone, sleeping time I have estimated 10% battery life to equal at least 12 hours.. With the Chinese Charger I pull the battery off, put it in the phone and I am at 100%.. Sorry for rambling on and on about this..