I have one of these. It looks nearly identical but mine is green. I went motocamping for 3 weeks with somewhat limited access to electricity at times. I think

I have one of these. It looks nearly identical but mine is green. I went motocamping for 3 weeks with somewhat limited access to electricity at times. I think my longest stretch was 3 days of camping with no access to plug in and recharge the pack. I was charging my iPhone 11, AirPods, and an Apple Watch. My phone was plugged into my motorcycle to charge/maintain while riding. The battery was positioned in a tank bag exposed to the sun for 8+ hours of riding per day. When I eventually used the battery's full capacity, any charge from the sun was basically useless until I was able to plug into line power again. I think after nearly a full day of riding after waking up to an empty battery, I might have gotten 3% on my phone when I stopped for the evening. When I returned home from the trip, I experimented with recharging the battery out on my apartment's veranda on the top floor with lots of sunlight all day. It took 3 or 4 days for the battery indicator light to move up 1 segment. Too long to be useful in any meaningful way. My point in all of this, is that these cheap "solar charging" battery banks are worthless unless you can live with waiting 2+ weeks to maybe charge your device. The panels are likely larger versions of the stuff used on calculators and should not be relied on. It's a marketing gimmick.