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I use a Garmin navigator and have a small 12 volt battery 9Ah Rechargeable Sealed Lead Acid AGM Battery under the front seat. I connect to the battery with a Car Accessory female Cigarette Lighter Socket cord that lies on the seat. I connect to the battery using a Car Accessory male Cigarette Lighter plug. And I charge the battery using a Car Accessory male Cigarette Lighter plug.