I’ve thrown away so many lanterns and flashlights due to damage caused by battery leakage. To solve the problem I take the batteries out once I’m done using it and store the batteries in separate zip lock bags based on size. Used batteries get labeled “used but good” and new batteries are label free. All bags get put in a recycled food container and stored in a cool area. Problem solved. If the lights go out, I light my candles first which are already out on display around my home and then get the flashlights and lanterns ready. This method has also made it easy to stay stocked up on batteries because it’s easy to see when I’m running low on a size. Currently I’m running low on AA and AAA.