Hardware compatibilityThe HP CO06XL Long Life Battery is compatible with the HP EliteBook 840 G1 Notebook PC and HP ZBook 14 Mobile Workstation.Be productive longer with the HP CO06XL Long Life Slice Notebook Battery, which slides onto the bottom of select HP ProBook 800 series Notebook PC s or select HP Z Books to help you be productive longer than using the primary battery alone. FeaturesUse this long-life battery in addition to your primary notebook battery to keep working longer in and out of the office.Charge the battery when it''s not in use with the included charging dongle that easily connects to your HP notebook''s Smart AC adapter.Enjoy the reassurance of up to a three-year parts replacement limited warranty. Additional support is available (North America only) seven days a week, 24 hours a day by phone, as well as through online support forums.