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What does "multistage charging" mean?

Charging OPTIMA® Batteries Compare OPTIMA® Chargers Digital 400 vs. Digital 1200 Are the OPTIMA® Chargers and Maintainer easy to use? Why are the OPTIMA® chargers different or better than others? What is the OPTIMA® Chargers Digital 1200 12V Performance Battery Charger and Maintainer? Benefits of the OPTIMA® Chargers Digital 400 and Digital 1200 12V Performance Battery Charger and Maintainer Are OPTIMA® Chargers Mandatory for OPTIMA Batteries? What batteries can I use with the OPTIMA® Chargers Digital 400 and Digital 1200 12V Performance Battery Charger and Maintainer? Can the OPTIMA® Chargers Digital 1200 12V Performance Battery Charger and Maintainer charge anything else besides batteries? Charging Your AGM Battery How to Resuscitate a Deeply Discharged AGM Battery Recommended Battery Voltage Do I need a special charger for my OPTIMA® battery? What does "multistage charging" mean?
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The OPTIMA® Chargers Digital 400 and Digital 1200 12V Performance Battery Charger and Maintainer Performance Charger employ the latest in digital, multistage charging. With up to six fully automatic modes, your OPTIMA Digital 400 or Digital 1200 Performance Charger will follow in sequence through stages 1 through 6 listed below:

Stage 1: Analyze your battery's condition, state of charge and quality of connections before charging.

Stage 2: Soft-ramp charging control for deeply discharged batteries when necessary.

Stage 3: Fast-charge bulk mode for moderately discharged batteries also known as normal battery charging.

Stage 4: Conditioning mode for conditioning your battery with a finish/complete charge.

Stage 5: Auto maintain, float mode for keeping your battery fully charged.

Stage 6: Automatic storage recondition mode – desulfates your battery when in storage and being maintained.