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A comment on Why get an expensive Pi when I have an old phone?. Parent comment

Re:Why get an expensive Pi when I have an old phone? by cowlevel on Saturday November 14, 2026 @05:09AM (#50495695)
Just plug all the battery slots in parallel to a 4.1V power source (that's a nearly full battery voltage). You probably have to solder them to make a reliable connection.
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Re:Why get an expensive Pi when I have an old phone? by randomblock1 on Saturday November 14, 2026 @05:25AM (#50495806)
I'm pretty sure the third/fourth pins are used for communication to the battery. I doubt the phone would be happy it wasn't responding. I vaguely remember some phones can just use a resistor for that pin? Either way it's not quite that simple.
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Re:Why get an expensive Pi when I have an old phone? by cowlevel on Saturday November 14, 2026 @06:51AM (#50496271)
Maybe. Try it and see. If it doesn't work it's probably just a temperature sensor (thermistor) and a resistor indeed simulates a certain temperature the same way your power supply simulates a charge state.
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