Vapir Oxygen Portable Battery Pack Introduction
This oxygen battery pack can be used either with a power adaptor (that is included in the package) or with a rechargeable battery, the purchase of which is optional.

Vapir Oxygen Portable Battery Pack Portability
The battery can be used by attaching it to the oxygen mini portable vaporizer by Vapir as per the given instructions.

Vapir Oxygen Portable Battery Pack Details
The mini vaporizer is equipped with the standardized battery pack of 1500mAH and can be used at a stretch for an hour on being completely charged. It is recommended, though, to charge the battery for 8 to 12 hours every time for complete charging and to charge it overnight for at least 12 hours before using it for the first time.

Vapir Oxygen Portable Battery Pack Warning
However, it is to be noted that the battery should never be charged beyond 24 hours because overcharging the battery can nullify the warranty.