OxLife Liberty Battery
$314.99
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This lightweight, rechargeable battery will last up to 4 hours on a pulse setting of 2 or 1.5 hours on a continuous setting of 1.5.
Battery time varies with the flow setting
It includes an LED indicator to help you determine the current battery charge as well as a reinforced pull tab for easy removal from the concentrator.
I purchased a Liberty 2 portable machine and wanted a backup battery. I found oxygen support on google the shipping was fast and the battery packaging was fine. The battery works well, it does what it's suppose to do and you can break up payments over time on a credit card. Highly recommend.