High Quality, high capacity, light weight rechargeable battery. No memory effect. Can be charged or discharged as needed without loss of capacity. Overcharge protection, with built-in battery life microchip. CE Certified. Capacity: 1850mAh Dimension: 551.82 x 39.07 x 10.66mm Compatible Models: Garmin-Asus nuvifone M20, nuvifone M20US Compatible Part nos.: 361-00039-20, 07G016793450, SPB-20, TD10091100270, TD10093000627, TDTD10093000695