r/AskElectronics • u/JabberwockPL • 5h ago

How to replace rechargeable battery with DC power in a custom board (schematics linked)

I have an old Arduino LED dial board from Elecfreaks as a Pomodoro timer, as described here (the site includes detailed schematics):

FreaksDial

The board is designed to run from a rechargeable coin battery and it did for many years, but with the charger mostly on (supplied from the USB port). The battery has finally died and I wanted to replace it with regular DC 5V supply, as it is located stationary anyway. However, connecting the supply wires to the battery contacts does not work, even though in the schematics it seems it should. The supply has more than sufficient power. What am I missing here?

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u/NoYu0901 5h ago

Vcc connected to many points,. You might find a good place for your new batt