The exact thing happened to me and I thought what a waste. I am going to try the fuse thing. Any pointers beyond what was originally posted in this thread? Has your fuse popped again?
Zero issues once I replaced the fuse. I rotate the battery pack with the other two I have to keep the charge cycles around the same. I'm not sure what caused the fuse to blow in the first place. Maybe the power supply was on when I plugged into the battery pack? I now plug everything in before turning on the power. I also turn everything off and then unplug the power.