The AAA Cordless Phone Batteries GMK 750mAh 16 Cells are a top quality replacement for your original cordless phone batteries fitted by the manufacturer. They have been made specifically for your cordless phone. You will enjoy maximum standby and talk time. Should the mAh rating on your current battery be higher or lower by 100mAh it will not affect the function of your phone.
If you use a battery with a much higher capacity than your original battery then it will not charge properly in your phone. This will mean short talk time, and an over all decrees in useful life-span of your new batteries. Our batteries are specifically designed and manufactured for use in cordless telephones. Here is what Wikipedia have to say about AAA Batteries.