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Rectangular black 3-cell lithium-ion laptop battery pack

Battery Technology Inc.

Battery Technology Inc. L77991-002-BTI 3-Cell 11.55V Li-Ion Laptop Battery

SKU CH-BA5Q-XGXD8 MPN L77991-002-BTI

A 3-cell 11.55 V Li-ion replacement battery compatible with HP EliteBook 850 G7, 850 G8 and 855 G7 models

  • Product typeLaptop Batteries
  • 3-cell 11.55 V lithium-ion chemistry delivers reliable mobile power
  • Designed for HP EliteBook 850 G7 and 850 G8 notebooks
  • Also fits HP EliteBook 855 G7 for flexible deployment
  • Replaces multiple OEM part numbers including HSTNN-DB90 and L77991-002
  • Brand-new condition ensures full rated capacity from first charge

Replacement Battery for HP EliteBook 850 G7.

This 3-cell lithium-ion pack delivers 11.55 V and replaces original part numbers including 28Y92UC and HSTNN-DB90. It is built for professionals who need a direct-fit power source for compatible EliteBook models without modification.

Thermals, Noise and Power Draw in Normal Use

The battery operates silently and generates minimal heat during typical office workloads. Its lithium-ion chemistry maintains stable voltage output across the discharge cycle, supporting consistent system performance without active cooling requirements.

Build Quality and Connector Implications

The pack uses the same form factor and connector layout as the factory unit, allowing tool-free installation in the battery bay. Compatibility with part numbers L77622-2C1, L77622-2C2, L77991-002 and L77991-005 ensures proper mechanical fit and electrical alignment for daily mobile use.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $62.99
Pricier than about 90% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameBattery Technology Inc.
Model nameL77991-002-BTI
Part numberL77991-002-BTI
Product typeLaptop Batteries
Size & build
Shipping weight0.45 kg
Package size25 × 25 × 25 mm

Questions about this item

How do I install the 3-cell 11.55V battery in my HP EliteBook 850 G7 and what step is often missed?

Slide the pack into the bottom bay until the latch clicks, then power on and let the BIOS recognise the new cell count before calibrating.

What maintenance will the L77991-002-BTI pack need over its life?

Run a full charge-discharge cycle every few months to keep the fuel gauge accurate; no user-serviceable parts exist inside.

What limit appears first when the battery runs a sustained load on an EliteBook 855 G7?

The 3-cell design hits its thermal and voltage floor sooner than higher-capacity packs, cutting runtime under heavy draw.

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