Our All-in-One pens have batteries that are calibrated to last longer than the oil supply inside the pen. Our rechargeable pen batteriess will last somewhere within the 50-75 draw range, depending on how hard a patient draws, and whether they are using one of our 280mAh Direct Inhale batteries, which come in a 2 pack, or the 350mAh Push Button Battery. We recommend having two batteries, as this will allow you to charge one while you utilize the other.
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