Designed for the Samsung Q1 Ultra UMPC, this 6-cell extended life lithium-ion battery charges to 100% in 3.5 hours and offers up to 8 hours of continuous run time. Compatible with Q1 Ultra systems: Q1U-EL, Q1U-V, Q1U-ELXP, Q1U-XP, Q1U-SSDXP, Q1U-CMXP.