All my real-life testing suggests it's a dud. Last four days in mexico/belize with 28 celsius on average jolla has not gained a single percentage of battery. It probably is because jolla on charger goes full throttle, not disconnecting its ssh daemon etc, and since it goes ladida even when not facing the sun it results in worse battery life overall. Oh and turned off, even midday sun never results in the second animation, you only see the cable about to be plugged in, never inaide with thw percentage

edit: I wonder if through addition of nfc sticker you could signal to jolla that solaroh is connected and to not go overboard/full steam when current is detected, no idea about the off charging though, doubt nfc is active then