It’s not evident all such products are being falsely promoted. The technical questions of fit for purpose would appear a more pressing concern.
That is compared to a smart charger designed to be permanently connected to a lead acid battery. They may or may not be the best for a battery out of use for many months. Some of the promoted products of this type may be effective in meeting the needs of a user to maintain a battery which is in use intermittently.
Is there any benefit if the battery is not fully charged and conditioned?. Is the output of a particular brand and model adequate to meet the needs of a typical battery, given it is not on at night, PV output varies with time of year, positioning and weather?. Which products might include a basic regulator?. Which products come with a protection diode?. There are aspects of how these products are intended to be used that we might question. The 14 day money back guarantee would be a worthwhile protection if it did not perform as expected Whether this is mentioned on the packaging I don’t have a pack shot. In retrospect it would be appropriate to mention not all cars have live lighter/accessory sockets, and it is up to the purchaser to determine how their vehicle is wired. It’s in addition to the supplied clip on connectors. The basic promo on their site mentions the package comes with a 12v vehicle plug. You could get around the problem by leaving the keys in the ignition and on accessory setting, which would keep the cigarette lighter connected to the circuit, BUT besides the obvious risk of leaving the keys in the ignition whilst the car is unattended, the current being used by other accessories in the car would likely outweigh the charging current of the very small solar panel anyway. What this means is that the solar panel cannot possibly do what the marketing spiel claims, it is a hoax, and it is a waste of money. I think it is fair to assume this is the case for most cars on the road. This means the solar panel CANNOT trickle charge the battery, no iffs, no but’s, period! With every car I’ve ever owned, the cigarette lighter socket is DISCONNECTED from the vehicle electrical circuit as soon as you remove the key from the ignition. Sounds like a good idea, BUT does it work? The marketing spiel leads the unsuspecting purchaser to believe the solar panel, when placed in the sunlight under the car windscreen, will keep the car battery topped up by trickle charging, while the car is parked. 
Small solar panels which sit on the car dashboard, under the windscreen, and plug into the cigarette lighter socket, can be purchased from car accessory shops.
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