Laptop battery BT04XL for HP Folio 9480m, Laptop says 0% plugged in, not charging. This is following a 2yr timeout for bad behavior in the bottom drawer of my desk, and then reinstall of Windows 7. IIRC it used to work.
I thought maybe it was just the drivers for the battery charging since I installed new OS. Uninstalled, reinstalled, updated drivers, etc. no change. Opened up the battery and measured each 3.7V cell: 2.5V, 2.8V, 1.4V, 2.2V.
I thought maybe the voltage was just too low for the laptop to start charging, so I attached my bench supply to the pack and charged it for a couple minutes at 1.5A. Got the pack voltage up to almost 15V.
Put the battery back in the laptop, now it says "1%, plugged in, not charging."
I'm guessing it's hesitant about charging the unevenly balanced pack. So if I disassemble the pack and charge each cell individually and put it back together, what are the chances of that working? I mean are they really "bad" or are they just unhappy about sitting for 2 years? I'll probably try it this weekend; just want to know it will be a waste of time.
I thought maybe it was just the drivers for the battery charging since I installed new OS. Uninstalled, reinstalled, updated drivers, etc. no change. Opened up the battery and measured each 3.7V cell: 2.5V, 2.8V, 1.4V, 2.2V.
I thought maybe the voltage was just too low for the laptop to start charging, so I attached my bench supply to the pack and charged it for a couple minutes at 1.5A. Got the pack voltage up to almost 15V.
Put the battery back in the laptop, now it says "1%, plugged in, not charging."
I'm guessing it's hesitant about charging the unevenly balanced pack. So if I disassemble the pack and charge each cell individually and put it back together, what are the chances of that working? I mean are they really "bad" or are they just unhappy about sitting for 2 years? I'll probably try it this weekend; just want to know it will be a waste of time.