[NTLK] Battery circuit

Hi
I'm looking for a circuit diagram and component list for modifying a AA
battery cage to take NiMH cells, recharging within the 2100.
Daniel Padilla has photos of such work on his web site. No diagram or
components.
I've searched the archives: not there as far as I can tell.
Can someone point me to a site with such information?
Many thanks.

SFT

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