Reply To: Main Fuse Great British Handcrafted Motorcycles › Forums › Spitfire – Original › Main Fuse › Reply To: Main Fuse 27 May, 2020 at 4:49 pm #5007 AlWorthMember As John has rightly pointed out, LiIon battery compatibility of the charger is very important. The ‘charge’ voltage should never exceed 15v. If not regulated older charges can and will ruin the battery.