With a full charge the Z1™ PowerShell™ Kit and Battery will power your Z1™ machine for 8.9 hours at 20 cmH20. Battery Life will last longer, at a lower pressure setting. This means traveling anywhere is possible. Take your Z1™ practically anywhere, and you will never be without your CPAP therapy. You are covered, even at home during a power outage, as long as your PowerShell™ is fully charged. The compact battery and cradleFits just about anywhere!