Intelligent charge control on these chargers makes them perfect for long term maintenance of batteries on irregularly or seasonally used vehicles. Chargetronic6/12 also has a bypass system to initiate the charging of extremely discharged or sulphated batteries. Suitable for lead-acid (wet or gel) or low maintenance batteries, these chargers react continuously to battery condition and deliver whatever charge rate is required. An LED display confirms the state of charge. These electronic chargers can be connected to a battery for an indefinite period - the intelligent circuitry maintains the batterys level of charge at its optimum level.