Ralph’s simple battery charger is essentially this simple voltage regulator circuit. He chose the voltage-setting resistors R1 and R2 to give him 2.5 V on the TL431 when the output sees 3.6 V ...

If you’ve ever worked with adding lithium-ion batteries to one of your projects, you’ve likely spent some quality time with a TP4056. Whether you implemented the circuit yourself, or ...

Make sure it is stored in a cool and dry place, and charge the battery to 50 percent before turning off the laptop. This limits the chance of damage due to complete discharge. Even simple steps ...