Here is a battery fuse story and perhaps a tale of caution. I was busy doing stuff on my ebike and decided that I needed to remove my 48 V battery. In some strange twist of thinking I picked out the dust plug on the battery and took out my keys and, thinking I was unlocking, stuck the key in the charge port. Zap. blew a fuse the small 5 amp one. had me worried for a while but I just went and bought a pack and replaced. Interestingly there was some arcing and debris in the fuseway so I had to sharpen the prongs on the fuse to get it to start in the receptacle.