Keep your Portable Outlet CPAP battery charged away from home with a 12V DC car charger designed for convenient recharging from a car, boat, or RV. The DC-to-DC cable connects a compatible Portable Outlet battery to a 12V socket in a car, boat, or RV, providing another way to maintain access to battery power for CPAP therapy when wall power is unavailable. The 3-foot cable offers a simple charging option for road trips, travel, and other situations away from conventional power. Compatible battery sold separately. Take your health to the next level with FSA eligible Home Health Care Products.