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Amazon.com: Kemimoto Dual Battery Smart Isolator Kit, 12V 140Amp Voltage Sensitive Relay VSR & Digital Double Voltmeter Monitor & Wiring Cable Kit, Battery Automatic Charger for UTV ATV RV Car Truck Marine
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Amazon.com: Polaris RZR 2nd Battery Kit, UTV Stereo Second Battery Kit w/ AGM Battery, Mount, Isolator, Wires & Hardware (Not For XP Pro Models) : Automotive
![Is this a good how to, on adding a second battery? I see some people don't use the relay and some do. Also how do I determine a good second battery to Is this a good how to, on adding a second battery? I see some people don't use the relay and some do. Also how do I determine a good second battery to](https://external-preview.redd.it/2M389S7B3gIhgHt3qixP13bQqSC9sL96N3lvnKPa2t4.jpg?format=pjpg&auto=webp&s=7b9e7fe22818224a348c6fba20f160099ceeec28)