Lighting, Stereo and Electrical Charging dual batteries December 30, 2015 Will be using a TRUE UTV-SBI-15 UTV dual battery isolator. Will both batteries charge when charger is connected to the primary battery and what chargers are you guys using? Secondary will be a AGM or GEL. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related