When the batteries in my remotes stop working, I open the remote and roll them around. They will work for a long time yet. I even do it a few times more and they will work again. It sure saves on buying batteries.
The other thing you can do is, towards the end of their life like it appears they're getting weak, etch the ends of the battery with a nail file or sandpaper. This help them transmit a little longer. I learned this working in an industrial shop. Have fun. :)
I have also heard that you can "bake" alkaline batteries in the oven at 200 degrees to revive them. I'm not sure how long they should stay in, however.
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