Cheap Daughter Board for Charging Two AA NiMH/NiCd Batteries in Parallel or Series

I am looking for a cheap daughter board that can safely charge two AA batteries- series or parallel, can alter to support either, but parallel would be preferred.
I am creating a docking station charger for 2 devices I have which both run off a single AA battery (which lasts about a week at the longest), and I want to replace the back cover with 3D printed cover with contacts to touch the base to start charging. My design has it so when it charges, an NPN transistor cuts power to device (hosted inside the battery bay, as final contact port #5 or 3; don’t remember how many I designed to expose, but I believe current design just needs battery terminals and npn transistor lead).

Tim,What kind of batteries are these and do you have a suitable charger already?
If so, the easiest hack would be to attach wires to the battery terminals in your existing charger (you could create a "dummy battery with wires if you don't want to modify the charger). Then you run the wires to your docking station.
Or you could get a cheap AA battery charger, remove the electronics and incorporate into your docking station.
This is assuming you only need to build one or two of them...

Battery bays only have enough room to store wires to connect to outside via metal contacts (easy for me to fab-past experience). Just normal rechargeable batteries. But they will likely get placed on charger for prolong periods of time, far more than safe un-protected charge. I want it to be recreatable without hacking another charger, as several friends may want the same final construct.

A Google search for "nicd battery charger circuit" came up with results that included some boards from Adafruit and Sparkfun. There was also a board from eBay. I don't have time to look at them in more detail but that should get you started.

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