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The hot shoe was bent slightly causing the flash contacts to not touch those of the camera. By using a socket from a socket wrench set, place it over the grids of the hot shoe and tap firmly with a hammer to straighten it.
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.