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Rectangular black lithium-ion laptop battery with six cells and connector pins

FOCUSTEC

FOCUSTEC CM03XL 6 Cell 11.1V 4000mAh laptop battery

SKU CH-10W2-CKY9Q

6-cell 11.1 V 4000 mAh lithium-ion battery fits HP EliteBook 740 745 750 755 840 845 850 855 G1 G2 and ZBook 14 15u models

  • Battery TypeLithium-Ion
  • 6-cell lithium-ion design delivers 4000 mAh capacity for extended runtime
  • Rated at 11.1 V and compatible with 10.8 V systems for stable power
  • Fits HP EliteBook 740 745 750 755 840 845 850 855 G1 G2 and ZBook 14 15u models
  • Replaces OEM part numbers HSTNN-DB4Q HSTNN-L11C-5 HSTNN-LB4R 717376-001 CM03 CM03050XL
  • CE RoHS FCC certified with built-in circuit protection and rechargeable up to 600 cycles

Compatible HP EliteBook and ZBook models

This lithium-ion battery fits HP EliteBook 740, 745, 750, 755, 840, 845, 850 and 855 G1 and G2 series, plus HP ZBook 14 and 15u mobile workstations. It replaces original part numbers HSTNN-DB4Q, HSTNN-L11C-5, HSTNN-LB4R and 717376-001. The unit is new and built to match OEM dimensions.

Certified safety and cycle life

CE, RoHS and FCC certifications confirm compliance with environmental and electrical standards. Integrated circuit protection guards against overcharge, over-discharge and short circuits. The pack is rated for up to 600 recharge cycles over its service life.

Capacity and voltage headroom

Rated at 11.1 volts with 10.8-volt compatibility and 4000 mAh capacity across six cells. It powers typical office workloads on supported EliteBook and ZBook models. Runtime decreases under sustained heavy loads or when the battery ages beyond its rated cycle count.

Highlights

  • 6-cell lithium-ion design delivers 4000 mAh capacity for extended runtime
  • Rated at 11.1 V and compatible with 10.8 V systems for stable power
  • Fits HP EliteBook 740 745 750 755 840 845 850 855 G1 G2 and ZBook 14 15u models
  • Replaces OEM part numbers HSTNN-DB4Q HSTNN-L11C-5 HSTNN-LB4R 717376-001 CM03 CM03050XL
  • CE RoHS FCC certified with built-in circuit protection and rechargeable up to 600 cycles

Specifications

Battery TypeLithium-Ion

Questions about this item

How many recharge cycles can the 6-cell 4000mAh lithium-ion pack sustain before it needs replacing?

The battery is rated for up to 600 recharge cycles over its service life, after which capacity will drop enough to warrant a replacement.

What is the first limit reached when the CM03XL runs continuously at full load?

The 4000mAh capacity at 11.1V defines the total energy available, so runtime ends when that charge is depleted.

Does the pack generate noticeable heat or noise during all-day operation?

It has no moving parts and built-in circuit protection, so it runs silently; warmth will be similar to the original OEM battery under the same workload.

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