NiMH & NiCd batteries are interchangeable in cordless phones.

Outline	Model	Type	Capacity	Price	Order
	STB949 CPB-431	Ni-Cd	600mAh 4.8v	$16.50Cdn ($13.20US)	Quantity:
	CS-P539CL	Ni-MH	1500mAh 4.8v (much longer life than NiCd & does not have to be discharged before recharging)	$22.00Cdn ($17.60US)	Quantity:

The above batteries will have different model numbers on the product pages since they are after market replacement batteries which are as good or better than the originals.  The current or mAh (milliamp hour) rating of a battery is an indication of the battery capacity or how long it will last on a charge, the higher the better.

There is a $7 Cdn ($5.60US) shipping and handling charge.
90 day warranty and no questions asked 1 month return policy.

Cordless Phone Batteries Home Page