High Quality, high capacity rechargeable battery. No memory effect. Can be charged or discharged as needed without loss of capacity. Overcharge protection, with built-in battery life microchip. Volts: 7.4V Capacity: 3400mAh/25.16Wh Dimension: 70.83 x 38.71 x 20.72mm Compatible Part nos: 29518, 38403, 46607, 52030, C8872A, EI-D-LI1 Compatible Models: Trimble GPS 5700, 5800, R8, R7, 54344