I've made a set of lipo cherger designs based on MAX1555, MAX1551 and MCP73831 that are toner-transfer manufacturing friendly and have some features:
- selectable USB/external DC power source - if you don't need USB, just chop off the connector and use DC pads
- for MAX155X parts - charging current selectable by solder jumper
- for MAX1555 and MCP73831 - charging and battery full indication LEDS; Note: MAX1555 charger indication relies on low mosfet gate threshold voltage - below (5V - Vfwdled), I've used 702 mosfets.
- for MCP7383 - charging current selectable by two resistors