12V 85mA Solar Power Car Battery Recharging Panel

Pros: I got this because I usually leave my car parked for days at a time and find my battery struggling to start the ignition.
I have a long car and the device's cable is long enough to let me place it by the rear window.
It's very easy to install, just plug it in and you're good to go. That is if your cigarette lighter socket stays connected to the batt even with the key turned to the off position.
It's a bit bigger than I imagined so I guess, it would live up to its 20+ volts rating without load (with load, voltage is about 12v.
Putting it about a couple of feet from a dim flourescent lamp, i measure about 1v.

Cons: If you're cigarette lighter socket does not connect to the battery when the key is in the off position, you'll have to find a way to connect it to the battery or find wires that are connected to the battery and tap there.

Other: It's a good product overall. I am now able to let my car security stay on for days at a time without fear of flattening the battery.

Pros: Good idea solar battery in the car! Now, at the end of April, in direct sun gives 80mA, I think summer may reach up to 100mA. The battery can not be constantly under the direct light, when the sun falls at an angle of battery issues 50-60mA. For me personally, this is not enough. My machine uses 80-90mA / h, and this round the clock. Need at least 2 batteries to try to compensate for discharge. LED flashes, it means consuming less, it's good. Summer in a car in the sun is very hot, I'm afraid that plastic does not melt ((

Cons: Price is a little overpriced. The plastic quality is open to question, the summer show.

Other: Let's see ... can buy another one.