Energizer 389 Silver Oxide Button Cell 1.5-Volt Battery. Delivers long-lasting, dependable power to your button-battery-operated devices, like medical devices, calculators, toys, and watches. Holds power for up to 5 years in storage, ensuring you have button batteries ready when you need them. Cell size: 389; Type: Silver Oxide; Volt: 1.5. According to some websites, you can recharge around 10 times before it's completely dead. You also cannot recharge a battery that's completely dead. It needs to have a little charge in it when you try to recharge it. Devices like portable radios will completely discharge a battery. Devices like cameras will give you a warning and shut down The circuit is designed to charge a 12V battery at 50mA. The LM317 forces a 1.25V reference voltage between Vadj and Vout. To calculate the value of R3 to give a particular charging current, use this formula: R = V / I. So with V at 1.25 volts and I at 50mA, R = 1.25V / 50mA. R3 = 25Ω. In the 9 volt battery, there are six cells connected in series. The calculation is 6 × 1.5 Volt = 9 Volt. To know the voltage of a battery, batteries are marked with nominal voltages which is the average voltage a cell outputs when is fully charged, but this may differ from the open circuit voltage. Dual Power regulator +12V/-12V using 7812, 7912. 24V 2A supply circuit Diagram. 18V DC voltage regulator using 7818. 5V Low Dropout Regulator Circuit using transistor and LED Make 5V low dropout regulator circuit using transistor and LED lowest voltage input is 6V so across it is 1V only, make output is 5V 0.5A. mgkY.

how to charge 1.5 volt battery