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Would the battery you are looking for be anything like this?:
It exceeds in mAh, but that should be OK. The point I'm asking about is, does it 'fit' what you are looking for, or if not, what's wrong with it?
One source indicates that the original battery in the ATD-3917 is the
Durabrand (? PDV-709 ?) or BAT09
but do you have specifications like size of package, or charging time, for that? or whatever battery is actually still in or recently removed from your ATD-3917.