I bought a Nokia car charger, at CompUSA for $12 US. But you can get them (the DC-4) on eBay for about $8 or $9 US. I keep the charger in my car always, and then I have it at work, since I drive to work, and I leave the regular charger at home. If the 770 was to ever run out of power during the day (unlikely), I could always take it out and stick it in the car to charge.

I get exceptional life out of the batteries - 4 or 5 if I am streaming radio, and basically all day if I am simply surfing the web. As a regular tablet, without using the internet, it will last longer. I am really pleased with the battery life.

If you have a short battery life, just turn the brightness down a little, and maybe decrease the sleep time setting.