0ur opinion:

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The Sunsei Solar 2-watt 12-volt charger protects against natural battery discharge and electronic drain in cars, boats and other small vehicles. Mounting virtually anywhere, this solar battery charger provides immediate trickle-charge when exposed to daylight, even through windows or a windshield. Even when you are miles away from the nearest electrical hook-up, you can keep your batteries charged. From maintaining boat batteries in storage to extending trolling time for fishers, the Sunsei Solar battery charger is the perfect solution, and also works great for small farm equipment and RVs.

What's in the Box
12-volt charger, cigarette lighter adapter, battery clamps, suction cups

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Buyer's feedback: - * Sunsei Solar Charger 135mA (2watt) ...
EXCELLENT Product !!! I have two of these & a third larger Sunsei solar charger model on my 33' boat. Because my boat is on a swing mooring (i.e. without shore power), these 3 units safetly keep all 3 battries on my boat in optimum condition & fully charged. We get temperatures ranging from 6C to 55C (Centigrade...yes very HOT) here in Dubai & these solar chargers have been working well for the last 2 years. Would highly reccomend them (several of my mates have purchased these as well - great value) !!!

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Buyer's feedback: - Works great
The Sunsei Solar Charger does a great job in maintaining the car's battery full loaded. All the necesary cables are included. In order to use the cigarette lighter for charging with the Solar Charger, you have to check if your cigarette lighter does heat with the car's motor off. If it doesn't, you will have to use the also included cable to connect the charger directly to the car's battery.

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Buyer's feedback: - * Solar Charger ends \"dead battery syndrome\" worries ...
With all the computerized and electronics in today's cars, there is always a constant draw on the battery. You won't notice a problem until you leave your car at the airport for a few days and discover that the battery won't start the car.

This is the fix. Plug it in the cigarette lighter (or power outlet for us non-smokers), and place on the dash. Suction cups provided to attach it to the glass, but don't leave it attached while driving (duh).

Some vehicles tend to suffer from "dead battery syndrome" more than others, but with this unit, my Camaro SS and ZO6 Corvette are immune to the problem.