Portability for Your CPAP Portable Devices The Z1 Auto with The Powershell™ $898.00 AirMini – ResMed $880.00 The Original Z1™ CPAP with The Powershell™ $828.00 Battery Packs Pilot 12 LITE CPAP Backup Battery – Medistrom $339.00 Z1 Extended Life Battery – HDM $339.00 Pilot 24 LITE CPAP Backup Battery – Medistrom $359.00 Z1 Power Shell with Extended Life Battery – HDM $449.00