This is the one we are using in the shops now and I have one at home. Good machine, great price for what it does. This ad does not mention that it also has a de-sulfating and a cell equalizing cycle. It can charge standard wet cell, deep cycle and AGM. It will charge Optima type batteries properly and charge from stone dead. It has a true float cycle as well. Fast charge and then switch to maintain.
YMMV
Fully Automatic Charging
The Smart Battery Charger is fully automatic and electronic, with a Digital Smart microprocessor control and an LED indicator for selecting your charging rate. The three stage automatic rapid charging operates at 40 amps, 20 amps, 10 amps, and 4 amps, with an average 5 minute engine start time and 4.5 hour full battery charge.
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The Smart Battery Charger features 3-stage recharging technology. http://images.amazon.com/images/G/01/stores/auto/detail-page/vec1093dbd-2.jpg.
This device also features a reverse hook-up warning alarm.
The LED display lets you know when the battery is fully charged.Works with Any Vehicle
The Smart Battery Charger is ideal for any 12 volt lead-acid battery types, including those that power cars, boats, lawn mowers, RVs, ATVs and more.
State-of-the-Art Technology
It uses a 3-stage automatic high-frequency charging technology to build the battery back up to its normal output level, making it more efficient at charging than conventional model chargers.
Built-in Safety Precautions
The Smart Battery Charger also has a spark-resistant reverse hook-up and overcharge protection circuit built into it to insure that the clamps are not accidentally affixed to the opposite terminals, which would damage the battery. The automatic float mode monitoring tells the unit when the battery is ready to avoid overcharging.
Warranty
Black & Decker offers a full 2-year warranty.
What's in the box
The Black & Decker Smart Battery Charger unit and heavy-duty cables and clamps.
Product Description
The Black & Decker automatic Smart Battery charger is spark-resistant and features a reverse hook-up, overcharge protection, and solid state circuitry. It features three-stage, automatic, high-frequency charging technology for quick and easy charging.