I've had the same experience. The batteries seem to go bad really really quickly, and the recharge potential degrades extremely rapidly with re-use. After just a few charges, they will hold essentially no charge.
I did find a way to get the charger to recognize them. Get a screwdriver and connect + to +, - to - terminals of the dead battery with a live one. That puts a little charge in and the charger can then see that it's a battery and do its thing.
Then my expensive charger croaked. I got a new one, but I'm starting to lose the faith.
It bit over a year of nearly a day-to-day use and no degradation in power. They seem to behave just as they did a year ago. Perhaps the accurate measurements would show differently, but +-10mins on a 6hr scale is not that important.
I did find a way to get the charger to recognize them. Get a screwdriver and connect + to +, - to - terminals of the dead battery with a live one. That puts a little charge in and the charger can then see that it's a battery and do its thing.
Then my expensive charger croaked. I got a new one, but I'm starting to lose the faith.