27A to 23A battery adapter sleeve
thingiverse
Sleeve to allow you to use a 27A 12v battery in place of a 23A 12v battery for some fan and car remotes among other things. 27A and 23A batteries are the same voltage and the same length but the 27A is smaller around. This adapter slides over the 27A so it can fit properly in the battery holder of your device. The 27A has a lower current rating and will probably not last as long as a 23A. But, in my case I had a box of 10 27As and needed to replace a 23As so, this was my best solution.
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