AVAYA 3910, BT-2499A Cordless phone battery replacement Designed to fit (among others) cordless phones made by AVAYA As a direct replacement to fit 3910, BT-2499A CS-BP990CL and the cordless phone products including 3910, BT-2499A This battery is designed as a replacement in the AVAYA product range, it should prove a more than acceptable replacement for the original and has a capacity of 800 , this may be higher than the original but will mean it lasts longer between charges, it is supplied by a ISO 9001 certified manufacturer and will serve well as a power source for your phone or other device as many batteries of this sort are now used for other functions. Battery Type: Ni-CD Voltage of battery: 3.6V Battery Capacity: 800