Home Slickdeals RYOBI 18-Volt ONE+ 4.0 Ah Lithium-Ion Battery (2-Pack). $79 (a savings of... Slickdeals RYOBI 18-Volt ONE+ 4.0 Ah Lithium-Ion Battery (2-Pack). $79 (a savings of 60%) By ARCOM - 28 October 2020 79 0 SHARE Facebook Twitter Go to the deal page: RYOBI 18-Volt ONE+ 4.0 Ah Lithium-Ion Battery (2-Pack). $79 (a savings of 60%)