I didn't even know AAAA batteries existed! I purchased these for my door sensor for my home security system. The door that they are currently on gets a lot of travel and as expected, the batteries for that door are going bad faster. All of the other sensors use the round flat batteries and are at 100%, these were put in after and after several months usage, now at 63%. All of my sensors continuously report door open/close/active and temperature. Overall these do the job and were a great price, I will purchase again.