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--------Charging diagram description at bottom-------- As a previous mechanic and one who loves to have his toys, a 2 bank charger has been a wonderful thing. Previously I had to disconnect and connect to the next battery rotating constantly throughout winter, but with this charger I will have zero issues keeping them all maintained and thus the batteries in good condition for spring start up. The charger itself is extremely easy to use, simply select the type of battery in the vehicle(12v flooded, AGM, Lithium or 6v battery) and it will do the rest automatically, including desulfate and maintain. It also has a force mode when your battery is really dead, down to 1volt where it will attempt to revive the battery... Usually under a certain voltage the battery will be permanently damaged, but it might be able to help you get another few months out of it! Inside of the box there are many many peices, including extension cables, clamps, the wall plug for your area and even some self tapping screws to hang it on the wall. A very nice assortment.. I do wish that it included some terminal ring connectors as most people will probably need them. They are available though and fairly priced. Safety features include integrated reverse polarity protection, a multi level safety firewall(protects from various conditions such as short circuits) and ignition protection(no spark, auto shutoff charger when starting vehicle). Every single terminal or clamp is fused as well! Overall it is a great charger with a top quality build and extremely safe to use. Keep in mind that this is not designed to jump start a car, it only provides 2 amps per output and no you cannot combine multiple to get more, it knows and turns off. I plan on keeping this attached to my garage wall above my bench forever, and with the included extensions, i wont even need to take the batteries out! Step 1 & 2: Analyze & Diagnose Checks the battery’s initial condition, including voltage, state-of-charge and health, to determine if the battery is stable before charging. Step 3: Recovery Initializes the Recovery desulfation process (if needed) for deeply discharged or sulfated batteries by pulsing small amounts of current. Step 4: Initialize Starts the charging process with a gentle (soft) charge. Step 5 & 6: Opportunity & Bulk Begins with opportunity charging at a high current, then steps down to the Bulk charging process based on the condition of the battery and returns 80% of the battery’s capacity. Step 7: Absorption Brings the charge level to 90% by delivering small amounts of current to provide a safe, efficient charge. This limits battery gassing and is essential to prolonging battery life. Step 8: Optimization Finalizes the charging process and brings the battery to maximum capacity. In this step, the charger utilizes multilayered charging profiles to fully recapture capacity and optimize the specific gravity of the battery for increased run time and performance. The charger will switch to Maintenance if the battery tells the charger that more current is needed. Step 9: Maintenance Continuously monitors the battery to determine when a maintenance charge should be initiated. If the battery voltage falls below its target threshold, the charger will restart the Maintenance cycle until voltage reaches its optimal state and then discontinues the charge cycle. The cycle between Optimization and Maintenance is repeated indefinitely to keep the battery at full charge. The battery charger can be safely left connected indefinitely without the risk of overcharging.