Here is my new portable power pack for my mount. Inside is a 12v 4aH battery. On one side is a port to plug a trickle charger in, on the other side is the port for a mount power supply cable. It also features an on/off switch so that power can be switched off during connection and disconnection to avoid shorts. The power out also has an internal fuse to protect the mount should anything go wrong. On top it has an M12 coupler so it can be threaded onto the leg spreader thread on the tripod. This is left slightly loose so that it can rotate if required.
P.S I'll also be adding a momentary switch connected to a voltage read out panel so that I can check the battery status
Thanks for looking