Mini 12 Volt Dry Charged Battery 1948-1964 FL Panheads Harley 4 1/16" x 3 19/32" x 4.5" 12 volt battery is a dry charged battery Do not over fill battery, fill to line level as noted. Use distilled water only. For custom application on 1948-1964 FL Panheads. **NOTE: Requires filling with electrolyte acid, available from your local auto parts store.