Optimate 5 with 2,8Amps is the ideal all in one tool to care for medium to large 12V batteries. In a weatherproof sealed enclosure that includes wallmounts, the Optimate 5 will diagnose, recover, charge, test and maintain your batteries automatically. Recommended for STD (with removable filler caps), sealed AGM (absorbed glass mat) & sealed GEL 12V lead-acid batteries from 8Ah to 120Ah, although it can also maintain larger batteries (it will just take longer to charge) Why Optimate 5? Forgot to switch off the ignition / lights or did not hook up the battery to a maintainer during off-season and now the battery is ‘dead’? There is no need to rush out and buy a new battery as Optimate 5 has been proven to save neglected, deep discharged batteries other smart chargers can’t. Think that batteries only last 2-3 years? Optimate 5 has been proven to extend battery life to 400%; batteries can last 8 years if maintained with Optimate 5. To make this work always hook up OptiMate 5 to the battery when the vehicle is parked and it will safely maintain the battery at 100%, never overcharging, thanks to its unique 30 min charge, 30 min rest cycle during every hour of long term maintenance charge. Includes 2 connection accessories SAE-71 permanent ringlet connector with weatherproof cap & SAE-74 set of battery clips. Fully automatic operation that includes all safety features such as reverse polarity protection, no spark connection.