I tried using my critical battery pack with a bishop wand packer , I’m not sure if the tattoo pen has issues is the critical battery , it wasn’t giving enough juice between the two to push the needles and the battery pack was charged , so I’m just waiting to hear back from bishop to see if it was a problem on their end , other than that the light is very dim and I can’t see my voltage on the machine .
Love it use it for my Cheyenne hawk pen just still waiting on the power dock
Did a 2 and 1/2 hour piece (8.5 volts) and only lost 1 bar of battery life. Nothing beats the feeling of going wireless! With critical you know are getting the best.