I shelved my Crafty+ for a couple years when I started down the dynavap rabbit hole and recently dug it back out only to find the battery was shot. If I remember right, when I tried to turn it on it wouldn't do anything and would just blink red and yellow when I plugged it in, but wouldn't power on at all or connect to the app, best I could get was flashing red while holding the power button and plugged in.
Anyways, I determined it was either the battery and/or fuse and set out to gather the parts to replace. It was a challenge to find the actual battery specs of the original battery and then impossible to find the exact battery with tabs already attached. I went with a Panasonic NCR18650G