How To Charge Duracell Batteries Without Charger. We recommend charging DURACELL NiMH rechargeable batteries only. 80 of full charge when using Duracell 750 mAh AAA NiMH batteries.

Duracell 1-Day Portable Charger Duracell Powerbank. Plug the batterys capacity into the equation and multiply it by 12 or 120 since NiMH batteries require more power to charge than what they output. Between a charger and a good battery after that switch on the charger.
I also have an Eveready charger that does the same.
You run the charger for about 30 minutes then turn it off long enough for the batteries to completely cool. I assume it has its own built in charging circuit. I also have an Eveready charger that does the same. Recharge non-rechargeable batteries in seconds.