Review on 🔋 POWISER Solar Battery Charger 12V - Efficient Solar Powered Battery Maintainer & Charger for Automotive, Motorcycle, Boat, Marine, RV, Trailer, Powersports, Snowmobile, and More (1.8W Amorphous) by Richard Alemayehu

I bought them to charge my RV's batteries while in storage. I live in Florida so we get sun almost every day. Where the batteries are I can't put suction cups on the window. I attached them to the side of the camper. It's a flat smooth surface. They fell off within a few days. The suction cups are tiny and I don't know how they're supposed to stay anywhere for a while. Unless I figure out how to attach them to something to stay out of the sun, they probably won't do me much good.