I accidentally found a battery case on Amazon.
I thought it was interesting.
And I bought 18650 batteries (cylindrical lithium ion batteries), so I bought them.
By the way, the 18650 batteries that I purchased are these.
Easy to assemble. Just put 18650 batteries in the battery case. The 18650 battery is available in flat and pointed types. This time, only flat type was usable. The pointed type did not enter because the overall length is long.
It was usable without a problem.
I made a video.
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