Versatile automatic charger and maintainer for modern and classic batteries. Perfect for maintenance of stored, unused or "stand-by" batteries, even for months on end. Very easy to use. Just select the charging output, 6V or 12V, according to the battery to be charged, then connect to the battery and to the mains. The rest is 100% automatic. Perfect for ALL rechargeable lead-acid deep-cycle and starter batteries of all constructions.