You grab your flashlight and turn it on, but all you see is darkness. When you open up the battery compartment, you immediately see the problem--the batteries have leaked. Batteries that leak in a flashlight make a mess. If the leak is small and caught right away, it can probably be cleaned up, and the flashlight can be saved. Larger leaks can easily ruin the flashlight. This is a common problem you can avoid by using some smart tactics.
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Remove the batteries from a flashlight that is rarely used. You can store the batteries along with the light, but don't install them until you are ready to use it.
Leave the batteries in a flashlight that you have placed in a glove compartment or other place to use in case of an emergency. Remove, inspect, and test the batteries at least every 6 months. If the batteries are run down, immediately replace them. Depleted batteries are more likely to leak.
Replace depleted batteries in a flashlight with fresh, new ones. Don't mix old and new batteries. Use batteries that are the same type, made by the same manufacturer.