Vexilar® V-410 Digital Battery Status Indicator. Connect it and forget it!
A fully-automatic 1-amp digital charger. It also serves as a battery maintainer. After your battery is brought to a full charge, the Charger 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 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 just connect this Universal 12V Automatic Charger and be assured that your battery will be ready to go when you are!