Optimate 2 smart charger-maintainer is a cost effective solution for long term maintenance of 12v Batteries. With 0.8A constant current Otimate 2 automatically brings the battery to full charge ,and then switches to a unique battery saving maintenance charge mode to keep battery at 100% ready. Recommended for standard ( with removable caps) Sealed AGM (absorbed glass mat), and sealed gel 12V Lead-acid batteries up to 50Ah. Fully automatic, and includes safety features such as no spark connection, and reverse polarity protection.