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Old Apr 30, 2007, 4:24 PM   #1
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Join Date: May 2006
Posts: 181

I have a Duracell 15 minute charger, which according to the specs, charges AA batteries at whopping 8.3A. During the fast charge phase, the batteries become aggressively hot and to keep them cool, it is forcefully cooled with a fan that sounds like a turbine.

The fan operates during the 15 minute session and during the 10 minute cool down.
After the cool down, charger enters top off charge phase 1, which takes 1 1/2 hours with Duracell 2650mAh batteries. After that there is a final top off cycle that takes an additional half hour, pushing the total charging time to full capacity to around 2 1/2 hours.

Duracell claims charging is done after the indicator turns off after 15 minutes and they do not include any explanation of the top off phase.

The available capacity of Duracell 2650mAh battery at 1,000mA discharge rate:

Charged for 15 minutes and pulled:

Charged through the entire "hidden" 2.5 hr cycle

Charged in a timer controlled, passive overnight charger
test in progress

Charge cycle: click image to enlarge.

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