Li-ion batteries are the most widely deployed battery energy storage system (BESS) today but understanding the benefits and cost effectiveness for a wide range of grid services needs to be validated for market expansion. In this work, commercially available cylindrical cells with four different chemistries from major Li-ion battery manufacturers are subjected to standardized tests developed by the U.S. Department of Energy Office of Electricity (DOE-OE) for frequency regulation, peak shaving, and electric vehicle drive cycles. The results of preliminary 15 months continuous grid service tests on four different chemistries are presented and compared in terms of capacity retention, resistance, open-circuit voltage (OCV), cyclic voltammetry (CV), dV/dQ, and AC impedance.