Integrated Battery Pack is Sturdy,Compact & Convenient: The Z1 & Z2 PowerShell is built to last, incorporating a soft, padded neoprene skin over a solid skeleton. Battery Modules and the Z1 or Z2 CPAP Machine slide and click into place in the PowerShell to create a single, sturdy, integrated unit. The PowerShell even includes a handy lanyard so you can hang your CPAP in a tent or on your headboard if you prefer not to rest it next to the bed.
Provides Plenty of Power For 1-2 Nights of Z1 or Z2 CPAP Therapy: The PowerShell holds a single battery module that will last, on average, 1-2 nights between charges. For extra nights away add additional battery modules -- at 9 ounces each they won't weigh you down! Battery modules will automatically recharge in the PowerShell when it is plugged into AC or DC power. The Z1 or Z2 CPAP machines do NOT need to be in the PowerShell when batteries are charging. If the Z1 or Z2 CPAP machine is in the PowerShell during charging then it must be placed in standby mode for the battery to charge.