I've been buying these for window alarms for years. They usually last a few years. The only leak they get is cold or heat at the window and sometimes I forget to turn it off and open it. But I switch off quickly. Sometimes I press the test button on the sensor to test the battery. If there's no green light, it's time to replace them all! Maxell seems to offer the best value for money. I've tried others for less or more and they vary, but consistency is more important than how I use them. I just wish there was a battery I could put in the window alarm. It is very difficult at any age to fit 4 slippery little batteries into a slot the size of an eraser!
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