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This almost trivial circuit may be used to charge a pair of AA or AAA sized rechargeable battery cells from sunlight.

An inexpensive rechargeable CMOS battery system that can be built from readily available parts.

Two Way Radio Batteries, Rechargeable Batteries, Radio Batteries, Battery Chargers, factory direct with lowest prices available!

an autonomous device that will periodically discharge A recharge Nickel Cadmium (Ni-Cd) or Nickel-Metal-Hydride (Ni-MH) battery packs so that they are always fresh and ready to deliver by VE2ZAZ

Operating the FT-817 from various types of batteries, such as Alkaline Cells, NiCd or NiMH rechargeable batteries. An useful article that compares usage of different types of batteries for the Yaesu FT-817

The PicoFox is a versatile fox transmitter for 2-meter ham radio operators, built around the RP2040 microcontroller. With open-source hardware and software, it can be customized to suit your needs, from APRS to other digital modes. This fully assembled transmitter comes with a rechargeable battery and antenna, ready for use. The design allows for easy addition of features like sensors or interactivity. Modulation is handled in software for smooth FM output, with ample CPU, flash, and GPIO available. Configure your PicoFox by connecting it to a computer via USB and adjusting settings in a text file. Explore the possibilities of this innovative transmitter for your amateur radio projects.