I sell a unit that allows you to charge your boat batteries for a specific time (2 to 12 hours) while in storage either at the lake or in your garage. This eliminates storage with batteries discharged or the worry of leaving your charger plugged in until the next trip. This extends battery life and protects your on-board chargers. I sell a 6ft model ($109.95) and a 25ft model ($119.95) with free shipping. If interested send me a pm or contact at batterychargerez@gmail.com and I will answer your questions. http://s1291.beta.photobucket.com/user/gwillip/media/DSC00087_zpsbe051dbb.jpg.html Pictures available at this site. Thanks