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 35Ah, although the OptiMate can also maintain larger batteries (they will just take longer to charge).
   * Meets all relevant EN & IEC norms and CE directives.
   * Splashproof housing (IP52) with built-in wall-mounting lugs.
   * Comprehensive selection of connection accessories including an output extension set.
   * 2 year limited warranty.