While supplies last, purchase this RYOBI 18V ONE+ LITHIUM+ High Capacity Battery with a Free 2nd 4Ah Battery included ($198 value if purchased separately). This limited time offer is an incredible value for any RYOBI ONE+ user. The RYOBI 18V ONE+High Capacity LITHIUM+ battery provides 4x more runtime, 4x longer lasting charge and 20-percent lighter weight than Ni-Cd batteries. The fuel gauge lets you know the battery status before work begins. Lithium-ion batteries provide fade-free power for maximum performance throughout the charge. Best of all, it works with over 70 great one plus tools.