• Never leave dead or weak batteries in a flashlight, as they are the ones most likely to leak.• Replace the batteries in your flashlight every few months if it is not used for extended periods of time. This ensures that it has fresh, working batteries and prevents leakage.• When your batteries get low (which you can generally tell by your flashlight becoming less bright than it used to be or going from bright to dim shortly after it is turned on), replace the batteries.  • Replace the entire set at the same time, with new batteries, all being the same brand and type. • We suggest you use premium brand alkaline batteries.• Do not mix old and new batteries together.• Do not store your flashlight in high temperatures.  This could accelerate defects in your flashlight, including possible battery leakage.• Inspect your batteries immediately if the flashlight has been dropped or had a hard impact.