Heinz M is right. The contacts can get an oxide coating over time and prevent current flow. This is a problem with small draw devices and remotes are generally very small draw. When you slide the batteries in and out you wipe off enough of the oxide to allow the current to flow again. You may have collected some oxidation on the contacts (bad contacts). Some remotes have an electrical loop that uses the same start and ending wire. As long as there are batteries in it, it will take their energy and order it into the loop as it pleases. Also, the battery + and - normally don%26#39;t matter for some products. The electricity can come out of either end. Here is a diagram of how this works. Hope this helps.
---%26gt;(- +)----%26gt;
%26lt;---(- +)%26lt;-----
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