NShi
NShi L77991-005 11.55V 56WHR 3-cell laptop battery
A 3-cell lithium-ion replacement battery rated at 11.55V and 56WHR for compatible HP EliteBook and ZBook Firefly models
- ColorBlack
- TypeBattery
- CompatibilityHP ELITEBOOK 850 G7, HP ELITEBOOK 855 G7, HP ELITEBOOK 850 G
- Battery Type3 Cell Lithium-Ion
- Battery Voltage11.55V
- Battery Capacity4610mah
- Compatible with HP EliteBook 850 G7, 855 G7, 850 G8 and ZBook Firefly 15 G8
- 55 V 56 Wh three-cell lithium-ion pack delivers extended runtime
- Replaces OEM part numbers including L77991-005, CC03XL and HSTNN-DB90
- Tested for correct voltage, circuit protection, stable current and low self-discharge
- CE, FCC and RoHS certified for safety compliance
GreenTech L77991-005 56WHR replacement battery
The GreenTech L77991-005 is a 3-cell lithium-ion battery rated at 11.55V and 56WHR. It replaces multiple OEM part numbers including L77991-005, CC03XL and HSTNN-DB90. The unit is designed for HP EliteBook 850 G7, 855 G7, 850 G8 and ZBook Firefly 15 G8 laptops. It arrives new and carries CE, FCC and RoHS safety certifications.
Installation and common issues
Installation typically requires removing the bottom case screws and disconnecting the old pack from the motherboard connector. The replacement uses the same 3-cell form factor and voltage so no wiring changes are needed. A frequent mistake is fitting the battery without first updating the system BIOS, which can prevent the new pack from charging correctly. Static discharge during handling can also damage the protection circuit.
Compatibility checks before ordering
Confirm the exact model name on the laptop service tag matches EliteBook 850 G7, 855 G7, 850 G8 or ZBook Firefly 15 G8. Verify the original battery part number is one of L77991-005, L77991-002, L77622-2C1, L77622-2C2, L77622-541, HSTNN-DB90, CC03XL or CC03056XL-PL. Ensure the laptop charges and runs on AC power before swapping packs. Buyers needing a higher-capacity 6-cell option or a different voltage cannot use this battery.
Highlights
- Compatible with HP EliteBook 850 G7, 855 G7, 850 G8 and ZBook Firefly 15 G8
- 55 V 56 Wh three-cell lithium-ion pack delivers extended runtime
- Replaces OEM part numbers including L77991-005, CC03XL and HSTNN-DB90
- Tested for correct voltage, circuit protection, stable current and low self-discharge
- CE, FCC and RoHS certified for safety compliance
Specifications
| Brand | GreenTech |
|---|---|
| Model | L77991-005, L77991-002, L77622-2C2, L77622-541, L77622-2C1, HSTNN-DB90, CC03XL, CC03056XL-PL, 28Y92UC#ABA |
| Color | Black |
| Type | Battery |
| Compatibility | HP ELITEBOOK 850 G7, HP ELITEBOOK 855 G7, HP ELITEBOOK 850 G8, HP ZBOOK FIREFLY 15 G8 |
| Battery Type | 3 Cell Lithium-Ion |
| Battery Voltage | 11.55V |
| Battery Capacity | 4610mah |
Questions about this item
How can I confirm the 11.55V 56WHR battery is working correctly after installing it in my EliteBook 850 G8?
After installation, boot the laptop and open the HP Support Assistant or BIOS power tab; the reported voltage should read near 11.55V and the design capacity should show 56WHR or 4848mAh, confirming the three-cell pack is recognised and charging normally.
What comes in the box with the L77991-005 replacement battery and do I need to buy any extra cables or tools?
The package contains only the 3-cell lithium-ion battery pack itself; no screwdrivers, opening tools, or additional cables are included, so you will need a small Phillips screwdriver to remove the bottom cover of your EliteBook or ZBook.
My laptop is an EliteBook 855 G7 — should I choose the CC03XL or the CC03056XL-PL version listed on the label?
Both part numbers refer to the same 11.55V 56WHR 3-cell specification that fits the EliteBook 855 G7, so either label identifies the correct replacement; simply match the OEM number printed on your original battery (for example L77991-005 or HSTNN-DB90) to be certain.
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