JumpStart smartPhone Battery
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If your smartPhone battery is deeply discharged it might just need a little kick. see
To make things simpler using: https://cdn.shopify.com/s/files/1/1509/1638/products/mb-102-breadboard-kit---830-breadboard-netzteil-adapter-33v-5v-65stk-steckbrucken-fur-arduinoarduino-zubehoraz-deliveryaz-delivery-24200099_500x.jpg
is very helpful.
You might want to make sure that the polarity is correct e.g. using +/red and -/black for your jumper cables. Otherwise a short circuit might happen with damaging effects.