Question about Canon SPEEDLITE 580EX TTL Flash

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Amperege of 580 EX-II

I use Duracell batteries (alkaline) for my Canon 580 EX-II Flash at the moment. But I want to switch to a rechargeable option.
Can i use 2,500 mAh or 3,000 mAh or 4,000 mAh rating rechargeable batteries with my Canon 580 EX-II Flash? Is there any problem with that? What is the maximum mAh rating i can use without damaging the flash? And how long does it take to charge them? Please advise

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  • Anonymous Mar 27, 2014

    Canon 580 ex flashes on 7 d and 60 d ..no flash on image

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Interesting Question!
The rating in milliamps is a matter of battery capacity and charging rates. The higher the better as you will get more flashes per charge as long as you have the correct charger to match the batteries’ capacity and use the correct charging times. Aside from this issue of duty cycle between charges- this has no effect on the power of the flash unit as to output. This cant burn out or damage the circuitry.

The issue here is VOLTAGE. Most AA alkaline batteries provide 1.5 volts. Most rechargeable AAs provide 1.2 volts. We are looking at a voltage differential of 1.2 volts (a 20% deficit) if 4 batteries are required. This MAY cause slower recycling times in order to attain a full charge for each shot. In SOME units that can cause a bit if overheating due to strain on the step up circuitry.

It so best to check with the manufacture or distributor of you flash unit before purchasing you rechargeable batteries and charger. If you units have a built in charging circuit this can definitely be problems if there is a mismatch in charging rates and voltage. If this is the case be sire to check your manual or with the manufacturer or distributor- there must be a list of compatible batteries.

Ed

Posted on Jul 23, 2008

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