i am using lenovo thinkpad edge E420. my system is not working on battery it is working on only AC power and my gauge is showing "85% available, (plugged in, not charging)" message and power manager is showing ' 85% remaining . the battery has failed due to normal wear. The battery can not be charged.Replace the battery'
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More aboutbattery charing problem
Sounds like you simply need to purchase a new battery. Batteries can and do wear out. It is caused by constant charging/discharging.