BL4018-Slide-Battery-Pack-18V-4-0Ah-Li-Ion-Black-Decker-BL4018-XJ-p-The-Black-amp-Decker-BL-Li-Ion-Slide-Battery-Packs-hold-their-charge-in-between-use-meaning-they-do-not-require-charging-before-each-use-and-are-ready-to-use-The-Lithium-Ion-technology-delivers-the-same-great-performance-of-NiCd-batteries-but-is-lighter-and-more-compact-p-p-Suitable-for-use-with-all-Black-and-Decker-18-volt-Li-Ion-power-and-garden-tools-p-p-Black-amp-Decker-BL4018-Slide-Battery-Pack-18-Volt-4-