15 minute is very fast, but strange they do not mention the capacity of the batteries.
They do say: "Will charge any NiMH batteries, but at slower rate". So what is the capacity of these batteries?
I have a flashcard recorder that runs 2 hours on 4 NiMH batteries, IF they are 2100 mAh. So what are those 15 minute batteries? 800 mAh maybe?
The highest capacity for AA batteries at the moment is 2400 mAh. Other types can go higher than this.
You always need a charged reserve set at hand, because the bateries suddenly stop working when they're empty.
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drdalet