he RYOBI 40V 4Ah Lithium Starter Kit - Have a high visibility LED fuel gauge to clearly indicate remaining runtime. E - Easy installatoin and removal of the battery with secure quick-release button. - 2X faster charging than 40V Battery Charger OP403A, allowing users to charge a 4Ah Lithium Battery in under an hour. - Includes OP40404 40V 4Ah Lithium Battery, OP408 40V Fast Charger and Operator's Manuals.