Don
Easy enough to get to the battery - it's one of the first things to come out when tearing down the controller.Speaking of controllers, does anyone know if larger batteries exist for the dualsense controller? Are they easy to install? I've not looked at teardowns yet
As long as you've got a good quality screwdriver (Philips 00 iirc) and some plastic spudgers (needed to prise up a trim without marking) then it's not too hard.
As to whether any bigger batteries exist, I'm not sure