One of the most import tools to use with your forge is a set of digital calipers. I bought mine from Harbor Freight. I was working on a project last night and need to take some measurements and my battery was dead again. I eyeballed using the printed marks and got pretty close. But I was trying to hunt down tiny watch batteries.
Then I remembered a hack I had seen years ago.
I also learned why I was having the problem…
If you measure current, you will see that the power off state draws 90% of the current of the power on state. For some reason, all electronic calipers seem to be this way- power off is actually display (only) off. THIS is why the batteries go bad quickly.
I was able to 3D print a battery holder and was back in business in 30 minutes.
I have plenty of AAA batteries charged and ready to go.