Application GPS devices Original Brand Garmin Chemistry Lithium Ion (LiIon) Voltage 3.7V Nominal Capacity 2400mAh Brand Master (this product is a compatible alternative to that of the original brand) Width 18mm Height 68mm Garmin Astro 220 Garmin DC20 Garmin DC30 Compatible With: Garmin 010-10806-00 Garmin 361-00029-00 Comments This battery is suitable for Garmin DC20, DC30 GPS dog tracking transmitters used in conjunction with Garmin Astro 220 receivers. Replaces the internal lithium ion battery models 010-10806-00, 361-00029-00. Information on Replacement Batteries