You will see that many universal chargers are capable of handling RAM batteries as well as disposable alkaline ones. RAM stands for rechargeable alkaline manganese. Simply put they’re a different variety of alkaline cells that are designed to be recharged. These cells have many of the benefits of regular alkaline batteries such as longer shelf life and greater electrical density. They also have a high recharge efficiency which means their capacity will remain more constant with each charge enabling them to be reused for longer.