I have a high performance lithium ion battery(replaced old battery) bought in June of this year for my HP laptop that I charged fully and discharged 4 - 5 times as told by the directions. After a little use I stored it for about a month and used my A/C cord for at home use. I installed back into computer and it didn't work at all. I turned off computer, took out battery, disconnected A/C plug, reinstalled battery, plugged A/C cord back in and the battery light stayed on for about 30 seconds than went off. I can send it back to manufacture but I just feel that there is something I might be doing wrong to get it going especially with light coming on. Laptop: HP Pavillion zv5320 Babs1 Thanks Howard, didn't realize there was an edit button!