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They should be the same voltage and type if you're going to use them in parallel. The capacity (mAH) doesn't have to match but it's a good idea.
Mixing NiMH 1.2V 120mAH and NiCad 1.2V 120mAH would be bad.
Mixing NiMH 1.2V 100mAH and NiMH 1.2V 135mAH would be okay
Mixing NiMH 1.2V 120mAH and NiMH 2.4V 120mAH would be bad.
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