Wish I had the computor savy to send a link but this old man has little to no tech skills on computors. "Battery Tender" is a brabd name, very well known and availiable everywhere. It is a small trickle charger for 12v batteries, but they also have a maintence feature. A battery that sits for longbperiods of time can get a buildup on the plates that slows down battery performance. The maintainer fearure keeps the plates from getting this buildup and adds life and performance to a battery. I have 4 of these units for my motorhome, boat, and my side by side. Plus an extra just case I need it. If your battery is hard to get at, they gave a set of leads that attach tovthe battery with a plug on the end. My leads are between 18 and 24 inches long so I can keep the plug in a convient location to plug in when needed. If you use the " Battery Tender" name you should not have any problems getting information.
