This report describes a synthetic approach to control the crystallite size of silver vanadium phosphorous oxide, Ag_0.50VOPO₄·1.9H₂O, and the impact on electrochemistry in lithium based batteries. Ag_0.50VOPO₄·1.9H₂O was synthesized over a range of temperatures. X-ray diffraction (XRD) was used to confirm the crystalline phase and the crystallite size sizes. Particle size and morphology were characterized using scanning electron microscopy and surface area measurements. Galvanostatic reduction and intermittent discharge were used to evaluate functional capacity and resistance. This systematic study of electrochemistry and material properties shows that deliverable capacity and cell resistance are impacted by both interparticle and intraparticle transport properties.