Why won’t my zune charge past 50%?

I just replaced the battery in my zune 120, but it won’t charge past 50%. I checked the battery voltages and know the battery is good. Are there any battery learning procedures for the zune 120?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0