What is the side slot on the HP 41CX for?

[Sylvain Cote]

(09-07-2014 02:09 AM)Joe Horn Wrote:  Namir: Are you sure that the original 41's came with a rechargeable battery pack? I seem to remember that every 41 came with the standard N-cell holder, and that the NiCad pack was an optional accessory.

Your recollection is the same as mine Joe.
To my knowledge, all HP-41 ever produced were shipped with the N-cell holder.
Here a picture with the N-cell holder, battery pack and the charger.

Sylvain