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Makita 7.2V BL0715 Battery Holder/Tester
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Stores 7.2V battery, and shows state of charge via meter at the press of the button.
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I have a Makita TD022D impact driver, which comes with two 7.2V batteries. There is no battery meter on the driver or the batteries (unlike the bigger 18V batteries). I use this to store the spare battery and to test the charge level.
Required parts:
- Battery Meter (https://www.aliexpress.com/item/4001025276668.html). I use the 1-8S adjustable ones for various projects. $1.52 AUD at time I created this.
- 4mm Tactile switch, should be less that $1, but I buy them in bulk like this kit: https://www.aliexpress.com/item/1005001827519363.html)
- Terminal: Can be hard to find, I purchased "Makita Terminal Gn900se/um164d/cl070d 643817-4" from https://www.partshopdirect.co.uk/makita-terminal-gn900seum164dcl070d-p643817-4/ for £2.49
Sorry, I don't have any photos of the construction, but its very simple:
- Print all parts (I didn't use supports)
- If you bought the adjustable meter, make sure the meter is set for 2 batteries (3.6V * 2) in series (2S) by creating a solder bridge on 2S pads, and removing all other solder bridges 1S, and 3-8S pads.
- Solder short wires between switch, terminal and meter to make a simple circuit, with the tact switch connecting the battery terminals to the meter.
- Glue the meter and tact switch into the cap, and glue cap onto the body. I used hot glue.