Can I upgrade my batteries to lithium-ion or a different battery chemistry?

Solution Different battery chemistries have different voltages and charge characteristics so unless another type is shown in the cross reference or manufacturer’s information the answer is no. NiCd batteries can normally be replaced by their NiMH equivalent and require a different battery charger if the charger was designed for NiCd only. NiMH batteries charged in a NiCd charger could overcharge the battery as would be indicated by the charger light staying on continuously even after charging is complete. In this case turn the charger off and remove the battery which will be fully charged. A NiMH charger can charge either NiCd or NiMH.  NiCd and NiMH batteries are interchangeable in cordless phones because of the type of charger they use.
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