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A quick search shows that package widely, and rather inexpensively, available in both AA and AAA size.

There's not a lot I can help with without physically putting a meter to it and probing about. It's a nice package looks very well built. One can easily identify the charging circuit for the on board battery, drivers and such. It's a three wire plug but only two positions are used for a DC input...

Need pics of the inside.....