Battery Tender, 540mA, 10W Solar Battery Charger 12 Volt – Weatherproof by Deltran 021-1164 Price: $104.95 (as of 27/09/2022 22:20 PST- Details) & FREE Shipping. Details

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10W solar panel with built-in Battery Tender 3-step microcontroller for super-smart charging that ensures that your battery is not damaged by overcharging
Output: 12 VDC, 540 mAmp DC, 5W max