This Pb137 charger circuit electronic project can be used for charging lead acid battery. Using the PB137 voltage regulator circuit and some other electronic parts can be designed a charger which is capable to provide 1.5A at 13.7 volts .
Using MCP73841 charge management controller chip, can be designed a very simple high efficiency charger electronic project for lithium ion or lithium polymer batteries .
A standard value 110 mΩ, 1% resistor provides a typical fast charge current of 1000 mA and a maximum fast charge current of 1091 mA.