Just had an i1 battery which refuse to wake up after going into hibernation. Tried charging it, and it won’t charge. When a charger is connected, the forth LED just blink non-stop and no charging takes place. This usually happens to old batteries which has not gotten the latest firmware updates.
Step 1: Battery Cover removal
Watch this video
Step 2: Seperate the battery PCB from the cover and then remove the white connector. The top middle white connector as shown in the pic.
Step 3: Connect the battery to the charger for about 45min, while the PCB is disconnect from the battery pack. Your battery packs now goes through unbalanced charging up to a certain level.
Step 4: Disconnect the charger from battery pack and connect back the white connector to the battery PCB.
Step 5: Reconnect back the charger and let it continue to charge in balanced mode.
Step 6: Insert the battery into the i1 to update the battery firmware.
Now you have an updated and revived battery!