It depends on the battery you have. For trailers that came with the Full River we recommend the current AGM battery we are using, the Trojan 31-AES 100AH battery, If you have or would like to upgrade to Lithium we recommend the NON heated BattleBorn BB10012. If you are upgrading from AGM to lithium we recommend adding the Victron BMV712 battery monitor, IP65 shore power battery charger and Orion DC/DC charger. These additions will allow you to properly monitor and change the battery on shore power or from your tow vehicle.