Posted several times in the past, but for the record, amazon.com has OEM batteries for the Droid for between $10-$15, sometimes less. They also sell little standalone chargers for about $15. So for about $30 and following the recommendations regarding battery use, the problem goes away.
At the moment, they're selling batteries for $6.26.
Amazon.com: Motorola DROID 1300mah Standard Battery: Cell Phones & Service
Bought two of these and the charger today with 1-3 days shipping and it was around $44. Not bad when Verizon wanted $40 for a replacement. Only bought these though b/c my old battery died and I needed a replacement, not because I was having bad battery problems.