Which devices are not compatible with Ni-MH rechargeable batteries?

Ni-MH rechargeable batteries cannot be used for the appliances mentioned below:

Waterproof appliances e.g. underwater light source. Ni-MH rechargeable batteries are not compatible due to the danger of the appliances exploding from the gas generated in the case of over-discharged batteries.
Incompatible appliances. If it is mentioned in the appliance’s manual that Ni-MH rechargeable batteries must not be used under any circumstance.
Appliances in which the rechargeable batteries do not fit properly due to structural differences in size between the batteries and the terminals. E.g. when there is no contact with either positive or negative terminal, when the battery’s diameter is too wide, etc.
Appliances with battery indicators. Although they will work, the indicator may show lower remaining capacity than in reality due to the difference in voltage between rechargeable and alkaline batteries.

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