I'll probably be tweeting our trip in November (unless hubby takes the cell phone away

) and my Twitter name is xrae if you want to follow.
My question is this: how do you preserve and/or prolong your battery life while in the parks? I do a lot of Twitter/Facebook updates from NASCAR events and my phone generally runs out of juice well before evening. (At Bristol in August I took my charger along and found a plug in the women's bathroom near our seats, how crazy is that to stand in the bathroom pre-race to charge a phone!? (how bad do you have it?) )
Do you prolific Tweeters carry an extra battery? Use more than one device during the day? Have a portable rapid recharging device? Carry your home charger and hunt for power outlets? I need to know! The battery on my phone doesn't like excessive Tweeting! lolol