Buy a couple of spare batteries
I drive another hot Android, the Galaxy S, and instead of hog-tieing the phone to minimise energy use, I bought a few spare batteries. You can get two plus a charger for about $10 on eBay. I get through a normal day on a single charge, but if I'm flying long distance or making heavy use of the phone, it takes less than a minute to power down, swap the battery, and restart. And while you're doing that, you can ask all those smug iPhone users around you how long it takes them to swap a battery.
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