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5-watt solar panel with built-in Battery Tender super smart charging controller. 100% portable battery charging and maintenance. Perfect for storage space without power access! Battery Tender solar panels are the only panels available with a built-in charge controller to prevent overcharging. 12V Nominal Voltage 270 mAmps. Temperature compensation sensor. Spark-proof. 3 lb. 13.25" x 16" x 0.875".