I start by opening everything up and seeing why the flash light will not charge anymore.
I found a broken connection from the charging port to the wire going to the circuit board.
This is the battery pack from inside.
There are 3 cells in this pack.
This is the charging part of the circuit board.
This is the back of the circuit board.
The charging connector and broken wire.
I solder the wire and plug in the power to test it. It works!
I then put everything back together and its all good again.