Cameron Sino Rechargeble Battery for Magellan Maestro 4050 Cameron Sino Brand New and High Quality Replacement Battery for Maestro 4050 Type: Li-ion, Volts: 3.7V, Capacity: 1100mAh Dimension: 50.31 x 36.61 x 5.83mm, Weight: 50.0g All Products are Certificated with ISO9001, RoHS & CE 14 Days Money Back Guarantee and 12 Months Warranty