Sterling Power BM12123 Battery Maintainer - 12V-12V
Save money on batteries and stop them from being destroyed by discharging. A flat battery means you need an expensive replacement.The auxiliary battery charger maintainer is simple to install and is a low cost product. It is designed to enable extra battery banks on a boat or a camper van to be kept topped up from a separate battery bank which has, for example, a battery charger / wind generator / solar cell connected to it.
