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I have a N-size battery charger (HP PN 92266a) which was for ni-cad batteries used in HP 41Cs. I read that N-size ni-cads are no longer produced. Does this make this charger obsolete? Can some other form of rechargeable battery be used? If so, what kind?

They are still available from Panasonic (175mAh)


Ni-cad N cells are also available from your local Radio Shack.

The cells that are no longer made are the 1/2N cells used in the 82120A battery pack for the HP41.