Black and decker 12 volt battery charger and maintainer. Use for battery maintenance charging rvs specialty vehicles antique and classic cars marine deep cycle batteries motorcycles lawn mowers atvs snowmobiles personal watercraft and more. The black decker bm3b battery charger maintainer features 6 volt and 12 volt charging selectivity. Use for battery maintenance charging rvs specialty vehicles antique and classic cars marine deep cycle batteries motorcycles lawn mowers atvs snowmobiles personal watercraft and more. The black decker battery charger maintainer features 6 volt and 12 volt charging selectivity. It is ideal for battery maintenance charging rvs specialty vehicles antique and classic cars motorcycles lawn mowers tractors atvs snowmobiles personal watercraft and more. This black and decker battery maintainer and trickle charger will work with both 6 volt and 12 volt batteries. The black decker bm3b 1 2 amp battery charger maintainer lets you say goodbye to dead vehicle batteries with 6v and 12v automatic charging. It s perfect for vehicles that only see seasonal use including rvs specialty vehicles antique classic cars marine deep cycle batteries motorcycles atvs snowmobiles personal watercraft and more.