This replacement battery is 100% compatible with the Ascom d62, i62 and 9d62 phones and battery chargers. The 1300 mAh capacity rating is guaranteed to extend phone Talk Time by 40% or 6-8 hours longer than the Ascom 660217 and 660190 batteries, which only offer a 930 mAh capacity rating. Manufactured using performance-grade power cells from Japan, which are proven to deliver maximum battery run time and total cycle life.