Hoover LiNX 18 Volt Lithium Ion Battery, BH50000 Fade Free Lithium-Ion Power - Unlike Ni-CD batteries, the LiNX interchangeable 18 Volt Lithium - Ion Battery sustains power during use Interchangeable - This one interchangeable 18 Volt LITHIUM - ION battery powers the LiNX Cordless Stick and Hand Vacuum for the ultimate in versatility, run time and cleaning performance Faster Charge Time - LiNX 18 Volt Lithium Ion batteries have an impressive three hour charge time compared to an 8 -16 hour charge time for traditional Ni - CD batteries Replacement battery for Linx models BH50010 & BH50020 series vacuums Two year limited warranty UL-listed