They are automatic units and handle batteries of up to 750ah capacity. They are known to be working. We have a 90 day full replacement warrantee if the unit is defective or fails within the warrantee period. DC Amps OUT Max: 116. The item "GNB 24v 3ph 750ah charger" is in sale since Tuesday, July 17, 2018. This item is in the category "Business & Industrial\Material Handling\Warehouse Loading & Unloading\Warehouse Forklift Parts & Accessories\Forklift Batteries & Chargers". The seller is "liftpartsoforegon" and is located in Portland, Oregon. This item can be shipped to United States.