3.7V Lithium-Ion Battery Charger - One Transistor and One Zener Diode

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I have a Li-ion battery of 3.7 volts. To recharge it, do I connect it directly to a 3.6V supply to get it charged again? - Quora

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Simple 3.7 V Li-Ion Battery Charger Circuit - Homemade Circuit Projects

1 Cell (3.7V~4.2V)

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