Google up 'Droid and battery. My daughter had so much trouble with her Droid that Verizon replaced it with a Blackberry. There seem to be a LOT of issues with Droids over battery life, how well (or badly) they charge, what affects battery life, etc.
If all else fails, write directly to the CEO of Verizon. The stores will try to blow you off, but corporate wants you as a customer. After the third or fourth time we took my daughter back to the Verizon store, the sales guy admitted there was a problem that his techs in the store couldn't fix. I asked for the contact info for someone higher up than the store whom I could contact for some resolution. The manager came over, with an attitude, and told me point-blank that he refused to "allow" me to escalate the issue. He wouldn't allow the sales guy to do anything more for me.
Yeah, well telling a 60+ year-old Vietnam veteran that you "refuse to allow you to escalate" the matter is not a good tactic. Within 24 hours I had found the names and addresses of both the CEO of Verizon and the CEO of Verizon Wireless, and sent off letters to both. Within three days I was speaking on the telephone with a very nice woman from the president's office. I heard later from the sales guy that the manager got a bit of a talking to about how to relate to customers with problems.