Tag Lenovo t440 notebook battery large current maintenance

Find the battery chip pU7 bq24760, and test large current on the bare battery board. Your hand just touches a place, which is very hot. Look at MOSFET, which is a common S-tube of q85, pq13 and pq34.Trace the source of q85 and replace it from think Parts motherboard. Plug in the battery and power on it. It will not be large current when it is powered on. It will not be auto power off when it is turned on. It can be charged and troubleshooting when it is installed for testing.