AA battery to USB adapter
thingiverse
Replace regular AA battery with USB powered one. You can set the voltage for 1/2/3xAA battery replacement.Required tools:mini DC-DC step down converter (11x17mm or smaller)https://www.aliexpress.com/item/4000938525410.html?spm=a2g0o.productlist.main.5.789ckc51kc51Ig&algo_pvid=a9838bfa-ce18-4c67-84f6-5aed02134cc2&algo_exp_id=a9838bfa-ce18-4c67-84f6-5aed02134cc2-2&pdp_npi=4%40dis%21USD%215.33%213.57%21%21%215.33%213.57%21%402101ef5e17051580594381509eef84%2110000011322538105%21sea%21HU%21137414099%21&curPageLogUid=5gwXJyDe0dRH&utparam-url=scene%3Asearch%7Cquery_from%3A2 pcs 3,5x15mm self tapping screwUSB A cablesome cable and soldering ironSolder the USB cable +/- to the input of the DC converterSolder some wire to the output of the DC converterplace the cable next to the screw (pay attention to the polarity!)Set the output voltage. 1xAA 1.5V, 2xAA 3V, 3xAA 4.5V
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