The item requires either the DC power cord (#1001956) or DC power cord system (#1012975) to operate with a Respironics unit. The Universal Portable Battery Pack, the newest of the Respironics DC Power Accessories, is the ultimate in power portability and convenience. At 14 pounds, this rechargeable battery is lighter and more compact than traditional gel cell, marine-type batteries that can weigh as much as 50 pounds. The new Universal Portable Battery Pack has a 14.4 amps. per hour rating. The Universal Portable Battery Pack includes carrying case with battery, user guide, and charger with power cord. The 12V, 2.3A switch mode charger is designed to effectively charge sealed lead-acid batteries while protecting the batteries from overcharging. Features of the Universal Portable Battery Pack are as follows: A universal voltage input of 100 - 240 AC Reverse polarity and short circuit protection Multi-colored LED charging status lights A charge time of 10 hours on a completely drained battery. Less if there is still power in the battery when charging begins. A shelf life of 6 - 9 months when not in use This item may be used together with Item# 1001956 Shielded DC Cord for use from a standard cigarette lighter socket found in most vehicles. As well, Item# 1012975 DC Power Adapter may used together with the Portable Battery Pack in order to plug into a standard vehicle cigarette lighter socket or connect to a free-standing 12 volt DC battery. Expected Run Times: REMstar Auto, REMstar Lite, REMstar Plus, REMstar Pro (with or without C-Flex: 7 Hours M Series (all models) (12 cm H20): 20 hours BiPAP Plus, BiPAP Auto, BiPAP Synchrony (with SmartCard), BiPAP SIT and BiPAP Harmony: 7 hours