Figure 5. The MAX1879 high efficient Li+ charger for 1 Cell (3.7V) type battery
The MAX1879 initiates charging in one of three ways: battery insertion, charger power-up, or external manipulation of the THERM pin. CHG\ LED turns off when the on/off duty cycle falls to 1/8, and charging terminates when the on-chip counter times out. Key safety features include continuous voltage and temperature monitoring, a programmable charger time-out, and a 8mA precharge current mode to charge near-dead cells. Automatic detection of input power removal shuts down the device, minimizing current drain from the battery. An overall system accuracy of 0.75% ensures that the cell capacity is fully utilized without cycle life degradation.
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Electronics Enthusiast
If you want to do something in your off time, here is some circuits that you can try, its lithium charger, usb charger for your ipod or else, or RS232 serial interface to your GPS or your nokia phone or anything similar.
All component for this small project I got from www.jameco.com and www.maxim-ic.com
-- Lithium charger
-- Nokia Cable
-- USB charger
check on this website for all those project Infoanda/hobby
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