Why do some types of batteries stay fresh longer if they are kept in a refrigerator?

Some batteries self discharge if kept at room temperature or higher temperature. NiMH and NiCD batteries tend to loose their charge.

Storing them at lower temperature will increase their shelf life by lowering their discharge rate dramatically.

Some of the batteries retain 90% of their charge for a month so it is better to sore the NiMH batteries in freeze and bring them back to normal temperature before using it.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates