Woot offers Ring Solar Panel - Compatible with Ring Spotlight Cam Battery and Stick Up Cam Battery (White or Black) for $21.49. Free shipping for Prime Members.

Product Description:

Non-Stop Solar Power for Spotlight and Stick Up Cam
A few hours of sunlight everyday will keep your Spotlight Cam Battery or Stick Up Cam Battery (2nd and 3rd generations) charged around the clock, so you’ll never run out of power. With an included tool kit and cable, you’ll be set up in just a few minutes.

• Weather-resistant design
• Adjustable mounting bracket
• Only works with Stick Up Cam Battery (2nd and 3rd generations) and Spotlight Cam Battery
• Power connection is 13 feet.
• Item dimensions is 7.75 x 5.50 x 0.50 inch
• Requires several hours of direct sunlight every day. Ability to recharge varies based on device settings, motion notifications and sun exposure in the area of placement.

Thanks Maggie