Amazon.com: Kemo 12V 20AMP LOW VOLTAGE BATTERY PROTECTOR FOR 4WD,RV OR BOAT protects your car battery from total discharge M148A : Automotive
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Amazon.com: Megaware - BatteryGuard Protector - Great for Boats, RVs, Semi Trucks, and Off-Road Vehicles - Shock and Vibration Absorber - Fits 31 Group Batteries (12.75 x 6.88 x 0.375 In) : Automotive