His latest endeavor is a LiFePO4 battery charger that he made out of parts he had on hand for under $0.50 US. (Although we think he really made it for the fun of making it.) The circuit is ...

When we saw [Max.K]’s automatic NiMh battery charger ... it brought to mind a charger that might be automatic in the sense that any modern microcontroller based circuit would be; one which ...