12V Battery charger adapter
thingiverse
Enclosure to hold Adapter to make a 12V battery charger fed from a laptop power brick. Uses XL4015 buck converter with current limit. ATTiny (Digispark) monitors and controls charging and shows results on an OLED display Enclosure supports a small fan to assist with heat dissipation. Construction details https://www.instructables.com/Car-Battery-Charger-Adapter/.
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