eco-worthy-us via eBay [ebay.com] has
Eco-Worthy 10W Solar Car Battery Charger Maintainer on sale for $19.99 - 15% w/ coupon code
FIFTEENFORYOU at checkout =
$16.99.
Shipping is free.
Features:- Suitable for keeping vehicles/boat battery charged during the weeks unused. No need to disconnect the battery or have someone start the vehicle periodically. The indicator light on the back can observe the charging state. And it's waterproof, you can safely use it outdoors(After experimental test).
- Works even on cloudy days. As frosted surface, the panel doesn't need film protection anymore.Charging is complete, please disconnect the connection.
- Equipped with SAE cable, just plug the cigarette lighter into the port or connect the battery terminal posts with the alligator clip, and the connection can be completed within 3 minutes! Suitable for car, truck, boat, lawn mower, motorcycles, trailer, dump trailer, tractor, RV, van, camper, ATV, utility vehicle Battery etc.
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I can't fully ensure your concerns aren't justified because I never logged the voltage out over time but I have run the 5w version for a few years now. My previous battery was able to stay alive for almost 2 years past the warranty date (autozone gold) until I did eventually run it low and it never recovered. The 5w version is safe for my 2013 truck's electrical system.
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