The Ansmann Energy 4 charger is more of a hi tech battery conditioner rather than a traditional charger. It can charge 1-4 AAA or AA cells; or 1-2pcs 9V / PP3 cells. Includes primary plug set for worldwide use. Can charge both NiMH and NiCd rechargeable cells. Ultra fast charging, typically 2 hours for 9V / PP3, 3 hours for AA 2000. Minus delta V charging. Auto diagnosis of inserted cells. Capacity quick test. Faulty cell detection. This has to be one of the easiest battery chargers out! 3 year warranty.