Using solar or photovoltaic cells for recharging is something we see more and more often in solar panels like those on roofs.
The planned spacecraft that will benefit from the Russian “gas” (i.e., laser) station in orbit are spherical, with solar panels and photovoltaic modules.
The solar panels will be charged by the sun, and the photovoltaic modules will be topped up by robotic structures fitted with batteries and pulse chargers based on a supercapacitor.
The robotic group will be tasked with ensuring the smooth operation of the small spacecraft belonging to the international search and rescue system Cospas-Sarsat, as well as satellite transponders for Internet, video and radio communications.
Read more here:
https://sputniknews.com/russia/201908061076482448-russia-unveils-ambitious-project-for-laser-recharging-of-satellites-in-orbit-/