CS03XL Battery HP EliteBook 840 848 850 G3 G4 - 11.4V 46.5Wh

Does your HP EliteBook 840, 848 or 850 G3 or G4 no longer last half a workday? Swap the worn-out CS03XL with this fresh 11.4V 46.5Wh cell to restore runtime. The CS03XL is the standard internal battery across the entire EliteBook G3 and G4 lineup.

Specifications

• Part: Laptop battery CS03XL (3-cell Li-ion)
• Capacity: 4090mAh / 46.5Wh
• Voltage: 11.4V
• Compatible: HP EliteBook 840/848/850 G3 (2016) and G4 (2017)
• OEM: CS03XL
• Internal battery, not user-swappable from outside

Symptoms of a defective part

• Holds less than 2 hours of charge
• Sudden shutdown above 20% capacity
• Battery hot at idle
• BIOS shows "battery should be replaced"
• Stops charging above 95%

Installation

🟢 Easy - around 20 minutes. Open the bottom panel, unscrew the battery and unplug the connector. No keyboard or motherboard work. Tools: T6 Torx, PH0, plastic spudger.

Frequently asked questions

Will it fit EliteBook 840 G5?
No - from G5 (2018) HP uses a different battery (SS03XL).

Does it work in a ZBook 14u G3?
Yes, ZBook 14u G3 and 15u G3/G4 share the CS03XL platform.

How do I check battery health?
BIOS > Diagnostics > Battery Test, or HP Support Assistant.