Here is an ideal Mobile charger using 1.5 volt pen cells to charge mobile phone while traveling. Here is an ideal Mobile charger using 1.5 volt pen cells to charge mobile phone while traveling. It can ...

Here is a tried and tested sample circuit of a Li-Ion battery charger that can be used to charge any 3.7V Li-Ion battery using a 5VDC (USB, Solar Panel…) power supply. At the heart of the circuit is ...