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I am trying to power a circuit with a Lipo battery and then charge the battery when connected to a mains supply. I need about 600mA at 3.3V in the circuit. I have looked at a few Maxim battery management chips. Not sure what would work best yet. I would like to find out if anyone out there have used some other chips that could work. Looking for a low cost solution without lots of frills and additional components.