HP 8-cell battery F4809A Works with COMPAQ BUSINESS NOTEBOOK NX9000 SERIES battery, COMPAQ PRESARIO 100CA battery, COMPAQ PRESARIO 2100 battery, HP PAVILION XT SERIES battery, HP PAVILION ZE4000 ZE4100 ZE4200 ZE4300 ZE4400 ZE5000 battery. These HP F4809A F4812A replacement batteries 100% Comply with and even outperform the OEM manufacturer's standard. HP F4809A laptop batteries come with full one-year warranty and 30-day money back!