rather mixed one

I am somewhat mixed over this charger.
The noise during charging and size of the transformer does not bother me but ...
1. On 4 AAA Duracell batteries, there is already one that refuses to recharge. I try, the red LED flashes, the download is done more for this battery.
2. The charge time is announced a scam. Instead of 15 minutes, it takes 3 times.
3. When a battery is fully charged, you remove it then put into the charger, it puts to flash red and you're off again for loading as if the battery was discharged.
Conclusion: disappointing.