KALORIK Salt and Pepper Grinder PPG 25714

I have to date purchased 24 of these, they make great gifts....everyone loves them.....they are a little diffecult to fill

So far it does work. But the wife has rejected it due to the straining noise it makes. We've used some bigger single grinder that clearly had bigger motors and probably bigger batteries. They didn't always sound as though they were on their last grind...