Hi @adaml0030 ,
Have you got a DMM (digital multimeter) so that you can test the voltage output from the charger?
This [http://www.electricshaverstore.com/i/2194/braun-shaver-adapter-cord-5511-2.3-volt-us-plug.htm|link] shows the the output from the adapter for a Braun Type 5513 is 2.3VDC. It may also be stamped on the charger itself if you wish to verify what the charger’s DC output voltage is.
This would be the first thing to check and see if the charger was providing the correct output voltage.
If it is providing the correct output when testing the output voltage (DMM Voltmeter leads connected to the plug connectors at the end of the cord that goes into the shaver) flex the cord where it leaves the adapter and check that the voltage remains constant. If the cord is fractured then the voltage fluctuations might have damaged the charge circuit in the shaver. Also flex the cord where it enters the plug at the end of the cord for the same reason
If it all tests OK, then you will have to open the shaver and inspect and test for any problems.
Here’s a link to a [https://www.youtube.com/watch?v=0WyhKIIc7vA|video] which shows how to replace the battery in a Braun BT3020 which I believe is a Type 5513 so it may be of some help.