After changing battery of Pro 4, you have chance to make component on the board failure, the weak point is Shottky diode on the main board, see link below, it may help but you must have proper tools
https://www.youtube.com/watch?v=kOScqCSul6M
=== Update (09/19/2019) ===
See the different between control board from China and board from original battery (LG)
Left is chinese battery, right is LG battery, you can use board from original battery to replace the new battery
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=== Update (10/02/2019) ===
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[image|1848250]
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see photo of control circuit of Pro4 battery from china and from LG, on the original board has chip control charging and heat sensor. replace the control board with original board can solve problem 100%
After changing battery of Pro 4, you have chance to make component on the board failure, the weak point is Shottky diode on the main board, see link below, it may help but you must have proper tools
https://www.youtube.com/watch?v=kOScqCSul6M
+
+
=== Update (09/19/2019) ===
+
See the different between control board from China and board from original battery (LG)
+
+
Left is chinese battery, right is LG battery, you can use board from original battery to replace the new battery
hi friend
After changing battery of Pro 4, you have chance to make component on the board failure, the weak point is Shottky diode on the main board, see link below, it may help but you must have proper tools
https://www.youtube.com/watch?v=kOScqCSul6M