Have you actually had to change them that often? I have some Iris contact and motion sensors that are almost 2 years old and still on their original batteries. These are almost 3 times the cost as regular CR2's. So, to break even, if you figure a 3 year battery life, you'd have to have the device for almost a decade before you started saving money. I suspect I will have moved on to the next best thing by then.
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