BTI L77991-002-BTI 11.55V 56Wh Li-Ion Battery for HP EliteBook 850 G7/G8 and 855 G7

Power through demanding days with the BTI L77991-002-BTI 11.55V 56Wh Li-Ion battery. This 3-cell replacement battery is engineered for long-lasting performance in HP EliteBook models, including the 850 G7, 850 G8, and 855 G7, as well as select ZBook configurations. It’s designed to be a seamless, high-quality OEM-replacement option that delivers dependable run time, improved energy density, and reliable safety features. With a capacity of 56Wh and a nominal voltage of 11.55V, this BTI battery gives you the freedom to work, study, or create away from a power outlet without constant recharging. It also comes with an 18-month manufacture warranty in the USA, offering peace of mind alongside its powerful performance. While providing robust everyday power, it also emphasizes battery health and device safety through advanced protection mechanisms to guard against overcharge, short circuit, and overheating. If you’re seeking a dependable power solution that restores your laptop’s original endurance, the BTI L77991-002-BTI is a strong choice that combines compatibility, safety, and value in one package.

• Extended run time for HP EliteBook 850 G7/850 G8/855 G7 – 56Wh capacity delivers longer days between charges, so you can work, edit, and collaborate without frequent recharges.
• Direct compatibility with popular OEM part numbers – Replaces 28Y92UC, HSTNN-DB90, L77622-2C1, L77622-2C2, L77991-002, and L77991-005 for a seamless replacement that fits the original battery bay.
• 3-cell Li-Ion technology at 11.55V – Lightweight, efficient energy with solid thermal characteristics to maintain performance across many charge cycles.
• Designed for HP EliteBook and ZBook Firefly 15 G8 – Compatible with multiple premium laptops from HP’s business and creator lines, preserving mobility and productivity in the field or office.
• Safety and warranty you can trust – Includes built-in protections against overcharge, short circuit, and overheating, plus an 18-month USA warranty for added confidence in your purchase.

Technical Details of BTI L77991-002-BTI

• Model: BTI L77991-002-BTI
• Voltage: 11.55V
• Capacity: 56Wh
• Chemistry: Li-Ion
• Cells: 3-cell
• Replaces OEM numbers: 28Y92UC, HSTNN-DB90, L77622-2C1, L77622-2C2, L77991-002, L77991-005
• Compatible models: HP EliteBook 850 G7, 850 G8, 855 G7; ZBook Firefly 15 G8
• Warranty: 18 months (USA)

How to install BTI L77991-002-BTI Battery

• Power down the laptop and disconnect it from any power source before starting.
• Remove the bottom cover and locate the existing battery connection to the motherboard. Carefully disconnect the battery cable.
• Remove the old battery, insert the BTI L77991-002-BTI into the battery bay, ensuring the connector aligns with the socket, then reconnect the battery cable.
• Replace the bottom cover and secure all screws. Turn the device on to confirm proper operation and charge status.

Frequently asked questions

• Q: What devices is this BTI battery compatible with?
• A: It is compatible with HP EliteBook 850 G7, 850 G8, 855 G7 and select ZBook Firefly 15 G8 configurations, serving as a reliable OEM-replacement option for those models.
• Q: What is the capacity and voltage?
• A: The battery provides 56Wh of capacity at 11.55V, using a 3-cell Li-Ion configuration for a balanced mix of run time and weight.
• Q: Does this battery come with a warranty?
• A: Yes. It includes an 18-month manufacture warranty in the USA for added peace of mind.
• Q: What OEM numbers does this battery replace?
• A: It replaces multiple OEM part numbers including 28Y92UC, HSTNN-DB90, L77622-2C1, L77622-2C2, L77991-002, and L77991-005, providing broad compatibility as a direct replacement.
• Q: Is this battery safe and reliable?
• A: The BTI battery includes safety protections against overcharge, short circuit, and overheating to help safeguard your device during use and charging.