CM03XL Battery HP EliteBook 840 G2 845 850 G1 740 - 5000mAh

Does your HP EliteBook 840 G2, 845 G2, 850 G1/G2 or 740 no longer last half a workday? The CM03XL is the standard external battery for these 14- and 15-inch EliteBooks from 2014-2015. This replacement with fresh Li-ion cells slides right in from underneath.

Specifications

• Part: External laptop battery CM03XL
• Capacity: 5000mAh / 56Wh
• Voltage: 11.1V (6-cell)
• Compatible: HP EliteBook 840/845 G1 G2, 850 G1 G2, 740 G1 G2, ZBook 14
• OEM: CM03XL, HSTNN-DB4Q
• External battery - no disassembly needed

Symptoms of a defective part

• Less than 2 hours per charge
• Sudden shutdown above 30%
• Battery hot at idle
• BIOS shows "replace battery"
• Charges only to 95%

Installation

🟢 Easy - around 5 minutes. The CM03XL is an external battery, so no screws. Slide both latches, lift the old battery out, drop the new one in and fully charge for calibration.

Frequently asked questions

Will the CM03XL fit EliteBook 840 G3?
No - from G3 (2016) HP switched to the internal CS03XL.

Works in a ZBook 14?
Yes - ZBook 14 (2014) shares the CM03XL platform.

How many cycles?
Typically 500-700 cycles in average use.