ATTENTION: March 7th, 2021 -  MacPen II batteries will now be on pre-order. Thank you for your patience and understanding. 

Additional or replacement backup battery are recommended when doing
multiple clients a day. Rotating the battery to charge between every
client to ensure enough power throughout the day!

 DO NOT OVERCHARGE THE BATTERY. Once the battery is fully charged, remove the charging line from the battery. Do not leave the battery on a charge for days, this may potentially ruin the charge and performance of the battery.