It's pretty tough finding the right motherboard battery if you don't have the dead one in hand. I couldn't find much information on the web and I tried to look on the motherboard for the battery code but couldn't find that either. Finally figured it out...
- HP DL585 G1, G2 - CR2032 Battery
- HP DL360 G1 - CR2032 Battery
- HP DL380 G1 - CR2450 Battery