SnHPO4 was synthesized by precipitation and characterized by X-ray diffraction. The discharge curve of electrochemical cells using SnHPO4 as active cathode material and metallic lithium as anode showed a first reduction step at ca. 1.5 V. X-ray diffraction patterns of lithiated samples showed very weak bands ascribable to metallic tin. For the voltage values lower than 0.8 V the well-known Li–Sn alloy formation takes place. An intermediate step appears in the range from 1.2 to 0.8 V. The capacity retention is stabilized after 10 cycles at ca. 200 mAh/g.