It was already about ¾ fully charged when I opened the packaging but I topped it off with the supplied mini USB cable. After about 30 minutes it was fully charged. I installed it on my new CNC Q2 machine and I was blown away at how long the charge lasts! I ran the machine for about 5 hours, between 6.5 - 8 Volts and it was still displaying a full charge! It's a solid little battery pack with an extremely easy to use interface! I purchased 2 batteries but 1 is incredible on it's own! I'm a huge fan of Rhein! Keep up the great work!
Do not hesitate to buy this battery. it's so simple to use the battery to last a long time and I've had no issues
with it at all. I also bought a tattoo machine from the Rhein, which works great with batteries.
really helps not having wires all over the place to do tattoos.