I took the battery apart to find out why my digital voltmeter read the battery as having only 7 volts output. So why is my garage door opener battery dead in two years? At four presses per day, that's 3600 days of opening your garage, or about ten years from that little battery! And most of us will agree that an unused alkaline battery will still have most of its life after ten years on the shelf, so it shouldn't be dead of old age in only two or three years. If each press is 1 second long and draws 10 milliamperes from the battery, you should get 14400 presses from an A23. Why should an alkaline battery fail in two or three years of minimal use? The rating of the A23, 40 mAH (milliampere hours), is 144000 milliampere seconds.
Maybe you can find the battery locally, but don't bet on it these days.īut you can repair it !! Think about it. Amazon will get you another pack, but it will take a week. It has only been two or three years since you replaced the battery, and that one was the second one in your A23 pack. Of course your door opener will fail at the worst time. The A23's 12 volts allows easy design of a door opener which puts out an infrequent but powerful burst of radio-frequency signal that is strong enough to work reliably from a fair distance under poor conditions. The reason A23s are still in use is that they are just right for simple remotes that aren't really used much, such as your garage door opener remote (2 1-second presses per day? 4, maybe?).
You can reverse the above and repair an A23 battery! A23 batteries are still available, though they began as photoflash batteries for cameras nobody uses anymore.
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