12V/9 AMP Lead-Acid BatteryFH1000 Fuse HolderMounted on the positive terminal of your battery are a fuse holder and fuse. Vexilar knows your battery can cause fires if a dead short happens, so we have taken the added safety precaution to include this fuse holder with a 3 amp fuse for your battery.Features: It comes standard with a 3 amp automotive fuse, but you can put in a size fuse from 3 amp to 10 amps. If your sonar system does not power up, check to see if the fuse or fuse holder is loose. If your sonar system does not power up, inspect the fuse itself, if the wire inside the fuse is burnt, the fuse must be replaced Yes, your Vexilar can run without the fuse holder by connecting directly to the battery, but please use it whenever possible for safety purposes. If for some reason you&&';;ve lost your fuse holder or would like to put them on all your Vexilar systems, they are available directly at vexilar.com, part number: FH1000 *Replacement 9 Amp battery. Compatible with all Vexilar ice fishing packs.