The OptiMate battery charger has a unique ability to desulfate and permanently recover batteries that have been neglected or deeply discharged.
Hook up the battery and OptiMate immediately checks if the battery is sulfated or not. If it is OptiMate applies ‘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 ‘bulk’ (constant current) charges the battery, the starting stage if no sulfation was detected. There-after the unique ‘verification’ (pulsing charge & check) stage provides low voltage desulfating care and tops off the charge. OptiMate  then tests & confirms whether the battery can retain sufficient charge to crank an engine before it engages long term maintenance mode.
During maintenance it “floats & tests” 30 minutes on, 30 minutes off, so the battery is always 100% ready, but never overcharged.
**The OptiMate’s high voltage desulfation mode cannot engage if vehicle electronics / wiring are sensed, so to effectively desulfate a battery, it must be disconnected from the vehicle wiring.
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THE easy- to-understand BATTERY ANALYZER