|The following is based on Fallout 3 cut content and has not been confirmed by canon sources.|
The discharge hammer is a weapon from the Fallout 3 add-on, Broken Steel that exists in the game files, but never used in game.
It's a super sledge that does increased electrical damage to robots.
The discharge hammer can successfully strike about 600 times from full condition before breaking.
This weapon can not be found anywhere in the game. It is obtainable only via console command on PC.