18650 battery holder with ON/OFF switch
Description
It is a remix based on this one: https://www.thingiverse.com/thing:6604714 I am using only the two-battery version. There is no so-called circuit protection as claimed in the original version. The original battery holder is too tight on the batteries. I got it fixed in my version. Please also note that this battery holder is more suitable for point-headed cells. Flat top cells may have poor connection. This 18650 x 2 battery holder has a compact size and is durable. I wanted to use it in a robot but it is missing an ON/OFF switch. From my assortment of electronic components I found a small switch good for this purpose. So this project is to install the switch onto the holder, making it a built-in component. The switch I used is this one: https://www.amazon.com/JESSINIE-Miniature-Latching-Electronic-Projects/dp/B0CDGXQC1G (Buy it from any provider you prefer, not necessarily amazon.) If you prefer using another switch with a different size, you may have to modify the model. This is not the smallest switch on the market. I tried using smaller ones but completely failed. It was found that when there is high enough voltage (8V in my case), electricity can pass through air in the very tiny gap between two metals. A mini switch cannot effectively cut off power even when it is turned to OFF. The original design of the battery holder has a wire bridging two batteries to form a serial connection. This bridging wire is the most convenient place to implant a switch. There are two STL files provided. The small one is an add-on cover for the switch. If you already have a print-out of the battery holder, solder a new wire with the switch and glue this cover to the holder. Another STL is an all-in-one design. Having it printed out, you still need: - spring plate set for battery holder x 2 (12 x 12 mm) - a small sliding switch Solder two wires about 1-2 cm to the switch. Wrap the soldering points by heat shrink tubing. Insert the switch into the holder. Solder the two wires to the two contact points to form a circuit. Test it with batteries to make sure the switch can connect and disconnect power. Finally inject hot glue to the bottom of the switch to seal the wire.
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