Battery Tender is a commercially available product on this side of the pond, by our host for example. It is a trickle charger, and like the coal tender of steam-powered locomotive tends to the coal needs of locomotive, it tends, in this case, to the needs of the battery, providing voltage as the battery voltage drops while in storage. They do have the ability to dry out the cells of a small battery, however, I usually check mine every week,and it never came close to being dry. The battery is just over one year old. I charged it up the other day, and it has held the charge, but I haven't had a chance to actually get it out on the road and see what happens. I also did clean up all the connectors leading to the trafficators, but have not measured the voltage there since they were cleaned. I'm thinking that I will need a new battery, but after only a year, with good maintenance, I'm wondering why.