The OptiMate Series battery charger has a unique ability to desulfate and permanently recover batteries that have been neglected or deeply discharged. However, not every ‘dead’ battery can be desulfated and neither can a desulfated battery be recovered to 100% of its previous ability. When a battery becomes sulfated it will suffer some damage / wear to the plates. The extent of the damage depends on how deeply the battery was discharged, how long it was left like that, and at what average temperature. The OptiMate’s unique automatic desulfation mode works like this : Once the OptiMate determines that the battery is sulfated it applies a voltage of up to 22V at a controlled low current for a maximum period of 2 hours, to recover the battery to the extent that it can again accept a charge using the more normal charging algorithm. As part of this, the recovery continues with the subsequent unique charge & check stage which removes remaining sulfate crystals from the plates. The charge retention test which follows this stage confirms that the battery has been adequately recovered before the long term maintenance “floating charge mode cycle” engages. The 0.6Amp OptiMate 3+ - now in a new ventless enclosure the Opti- Mate 3+ includes wallmounts and the new bullet SAE connectors. OptiMate 3+ saves neglected batteries other chargers can’t! It will also safely maintain your vehicle’s battery during long term storage. Hook up the battery and all OptiMates immediately check if the battery is sulfated or not. If it is OptiMates apply ‘first aid’ in the form of a voltage of up to 20V, at low current for up to 2 hours, to recover the battery so it can again accept a charge. It then recharges, tests and then maintains the battery. “Hook up OptiMate and walk away” - 100% safe & effective 24/7 maintenance. Recommended for all 12V lead-acid batteries from 2Ah to 45Ah.