<p>This PARI Trek S Lithium-Ion Rechargeable Battery Pack is an optional (but very helpful!) accessory for the<span> </span>Trek S Portable Nebulizer Compressor System. Designed to integrate perfectly within the structure of your PARI Trek S, this great, lightweight battery will ensure you can take your treatments anywhere.</p> <p>A lithium-ion battery, this unit lasts for 1 hour of treatments per charge and has no "battery memory" which means you can recharge it at any battery level. You can easily recharge your battery using either the AC wall adapter or the DC 12-volt plug adapter in your car.</p> <p>Includes one Trek S Rechargeable Battery Pack.</p> <ul></ul> <h3></h3> <h3>PARI TREK S BATTERY SPECIAL INSTRUCTIONS</h3> <p><strong>Please read these special instructions from the manufacturer for the PARI Trek S Lithium-Ion Battery.</strong></p> <p>When not regularly using the battery, the battery should be fully charged every six months to optimize and preserve the life of the rechargeable battery. NOTE: If the battery goes for a long period of time without charging, battery life will be decreased. The battery should be stored fully charged in a cool dry place.</p> <p>If the charge indicator does not appear, or if all four indicators are blinking, the battery has failed and should not be used.</p> <p>NOTE: Do not leave the multi-voltage AC Adapter plugged into the rechargeable battery for more than 7 days. Leaving the battery connected to the power adapter for long periods of time may decrease the life of the battery.</p>