Charge 2S LiPo batteries from a USB port
Over time quite a lot of projects have been published on Elektor Labs. The recent projects and those that get updated frequently remain visible at the top of the project list, but there are many interesting old projects in various states that we tend to forget. So, going back in time, here is one that may be as useful to you as it was to the author when he posted it: a simple USB charger for 2S LiPo batteries. Charging one cell from a USB port is easy, but two cells require more than 5 volts. It is even possible to adapt the circuit for three cells.