SKU: 40226621099

BTI L77991-002-BTI 11.55V 56WHR LI-ION BATTERY 28Y92UC, L77991-002, HSTNN-DB90, L77991-005, L77622-2C1, L77622-2C2 ELITEBOOK 850 G7, ELITEBOOK 850 G8, ELITEBOOK 855 G7, ZBOOK FIREFLY 15 G8

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Ships within 48 hours · Estimated delivery Aug 26 - Aug 31

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Description

BTI L77991-002-BTI 11.55V 56WHR LI-ION BATTERY 28Y92UC, L77991-002, HSTNN-DB90, L77991-005, L77622-2C1, L77622-2C2 ELITEBOOK 850 G7, ELITEBOOK 850 G8, ELITEBOOK 855 G7, ZBOOK FIREFLY 15 G8Power 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. Its 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

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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 40226621099

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4.5 ★★★★★
Based on 6 reviews
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Product Reviews
C
Verified Purchase
CV
Bozeman, US
★★★★★ 2
Not for aggressive chewers
My 14 pound puppy chewed a big chunk out within 30 minutes. Would not recommend if you have a dog that likes to tear into things
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026
G
Verified Purchase
Gail Plaut
Lowell, US
★★★★★ 1
Not for aggressive chewers as labeled; poor quality
Really disappointed in this item. My barely 16 lb., 1 1/2 yr old labradoodle chewed right thru the plastic in literally 6 seconds. I was going to toss it but at $18, the item should live up to its description-this toothbrush toy is rated 80% on the aggressive chew scale as per packaging…NOT AT ALL! She bit off a couple off chunks immediately, then proceeded to bite off the spikes…couldn’t believe how quickly the toy was destroyed & I took it away within moments of giving it to her.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 10, 2026
A
Verified Purchase
AMAZONCUSTOMER
Cuba, US
★★★★★ 5
great for my dog
my 1 y/o pomeranian won’t let me brush her teeth. she also needs a lot of enrichment. i love putting a dollop of toothpaste, some wet food & few pieces of kibble in this toy for her. it keeps her busy for about 10 minutes and she really enjoys playing with it while consuming everything she can out of it. wonderful way to enrich while giving dental care. she is also a pretty good chewer and it’s still in one piece!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 7, 2026
M
Verified Purchase
Ms. Marie
Belleville, US
★★★★★ 5
Great Product!
Size: Medium, Color: green, orange, pink, Pattern Name: clean tuff bone bacon
My dogs love their dental chews! This product is durable and the perfect size for each of my dogs. I've purchased two of them (medium and large). One of my dogs is an aggressive chewer and this product is holding up. Hartz makes great pet products. I'm very happy with the product.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 30, 2026
S
Verified Purchase
Sumerr Scott
Phoenix, US
★★★★★ 5
Good quality
Size: Extra Small, Color: blue, purple, Pattern Name: clean tuff bone bacon
My dogs favorite toy. It’s so small and cute lol it’s lightweight and easy for her to chew. The quality is great, it’s lasting and no broken pieces.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 18, 2026

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