I have used Duracell Coppertop (alkaline) batteries for years. Dependable as they are, they can still fail. Duracell offers a generous guarantee against defects in materials and workmanship. Should any device be damaged due to a battery defect, Duracell will repair or replace it at their option if it is sent (postage paid) to Duracell with the batteries. However, not everything is repairable or replaceable. I stored batteries with a vintage board-game (Mystery Mansion). I knew not to store batteries in a device, such as this game's little computer. I removed them but, alas, stored them loose in a plastic bag with other game parts for several years. When all four batteries leaked, paper components in that sealed plastic bag absorbed the liquid and were ruined. Lesson learned: always store batteries separate from other items, in a sealed plastic container that can be relied uppon to hold liquids and will not be affected by corrosive liquids or salts.