Battery connector identification problem

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I have an ECS i-buddy A907, which of course has an external battery.
The battery connector cable has been lost, and I can not find another
because I can not even identify it for retailers.

The battery side plug is a 3-pin (2 large diagonal, one small bottom
left corner). The pc side is a 4-pin ( squared pattern).
It connects my nickel hydride EM-903N battery to the desknote.

Can someone please help with the id, name of this type of connector? I
am hoping to be able to order from a local retailer or radio shack,
but anywhere would work.

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