Measuring systems

I tried to recharge the lithium battery that works with my drill. After twenty minutes, the charger said the battery had failed.

Fortunately, I have a second battery. I put that into the charger and it also showed a failure.

Neither battery had failed. The charger had.

       

from Seth Godin's Blog on marketing, tribes and respect https://feeds.feedblitz.com/~/627429824/0/sethsblog~Measuring-systems/