Due to their equal nominal voltage level (1.2V) Ni-MH can be used instead of Ni-Cd. When this is the case, please use a charger for your Ni-MH rechargeable batteries. However, when using appliances which require more than one rechargeable battery, Ni-Cd and Ni-MH cannot be used at the same time due to their differences in discharging characteristics. In this case, the type and capacity of all batteries must be the same.
Ni-MH cannot be used instead of Ni-Cd, as the Ni-MH will degenerate quickly because it will be charged under the charging conditions for Ni-Cd (which are different to those of the Ni-MH).