Vexilar V-410 Battery Charger is a fully automatic 1 amp digital charger. It also serves as a battery maintainer. After charging the battery to a full charge, it automatically switches to a float mode. The battery is held at a full charge until you're ready to use it. The storage period is the most difficult part your battery's life. During this time, the battery can degrade, sulfate, and be unusable when you need it. That's why you need to maintain the battery during storage periods. You could mark your calendar and charge your battery each month, or you could connect this Universal 12 Volt Automatic Charger and be assured that your battery will be ready to go when you are. Fully Automatic 3-Stage Charging 1 Amp 12 Volt Output Digital Operation - No Heavy Transformer Will NOT Overcharge the Battery Colored LEDs Indicate Charge Model Connect it and Forget it technology