update 1: NASA wants ideas for keeping Moon missions powered in the dark
update 2: NASA’s Artemis Rover to Land Near Nobile Region of Moon’s South Pole which is informative here
TechCrunch's NASA’s VIPER lunar rover will hunt water on the Moon in 2022 says:
VIPER is a limited-time mission; operating at the poles means there’s no sunlight to harvest with solar panels, so the rover will carry all the power it needs to last about a hundred days there. That’s longer than the U.S. has spent on the Moon’s surface in a long time — although China has for the last few years been actively deploying rovers all over the place.
yet the image there and in the NASA.gov's Moon-to-Mars feature page it links to; New VIPER Lunar Rover to Map Water Ice on the Moon show solar panels, suggesting that if the hundred-day power source is rechargeable, it could be recharged by going back to wherever those obvious solar panels were used.
Question: What is the VIPER lunar rover's 100-day power source, and why can't it recharge it using its solar panels?
Please cite authoritative sources and not just a blurb in a popular news outlet. My question was inspired by a confusing and potentially self-inconsistent blurb in a popular news outlet, but I'm looking for an authoritative and reliable resolution to this conflict. Thanks!