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Are there battery operated portable oxygen concentrators?

Yes, battery operated portable oxygen concentrators (POCS) exist and are widely used by individuals who require supplemental oxygen therapy while they are not confined to their homes. POCs allow patients to conveniently carry, transport, and operate the device, providing them with independence during their everyday activities, travel, and leisure pursuits. The portability is enabled by rechargeable lithium-ion batteries or external power sources like vehicle DC adaptors, enabling a degree of mobility for users.