Replacement batteries for the MN-1s
The NiCd batteries in the MN-1s are over 20 years old and won't hold charge for long, if at all. I have brand new MN-1 replacement NiMH batteries that can be recharged over 500 times. These batteries have 20% higher capacity than the original NiCd betteries (330mAh instead of 280 mAh), and without the dreaded memory effect. These NiMH batteries are FULLY compatible with the MH-1 (it is untrue that the NiMH batteries would damage the MH-1). Also they have better performance and provide twice as many recharging cycles than the NiCd batteries. Furthermore, they do not contain highly toxic cadmium, making them the most environmental batteries available today.

The MN-1 replacement batteries (bare cells only) are $45 each, and re-celled MN-1s are $70 each.
Replacement battery for the MN-1. The top one is the original. I can now supply DN-1 batteries as well as MN-1 batteries.