Fancy Buying CI03/CI03XL Laptop Battery for HP ProBook

Fancy Buying CI03/CI03XL replacement battery restores reliable, long-lasting power to HP ProBook 640, 645, 650 and 655 G2/G3 laptops with 51Wh capacity and multi-protection circuitry.

If your HP ProBook is losing runtime or shuts down unexpectedly, the Fancy Buying CI03 (also sold as CI03XL / CIO3XL and compatible part numbers like HSTNN-UB6Q and 801554-001) is a direct replacement designed to match OEM fit and performance. This 11.4V, 51Wh Li‑Polymer pack uses three cells and integrated safety circuits to protect against overcharge, overdischarge, short-circuit and temperature extremes while delivering up to hundreds of recharge cycles.

How does this battery restore laptop runtime?

Replacing an aged battery with the CI03/CI03XL supplies the original voltage and a fresh 51Wh capacity, which increases available runtime and stabilizes power delivery. The internal battery management preserves steady output under typical office and mobile workloads.

• Rated voltage: 11.4V and capacity: 51Wh for consistent performance
• Li‑Polymer chemistry for compact size and energy density
• Three-cell configuration designed to match HP ProBook battery bays
• Built-in protection circuits against overcharge, overdischarge and shorting

Which HP models and part numbers will this battery fit?

The Fancy Buying CI03 series fits a wide range of HP ProBook 640, 645, 650 and 655 models across G2 and G3 revisions. The listing includes many cross-reference part numbers so you can confirm compatibility before purchase.

• Compatible models: ProBook 640/645/650/655 G2 and G3 notebooks
• Cross-reference: CI03, CI03XL, CIO3XL, HSTNN-UB6Q, HSTNN-LB6T, HSTNN-PB6K, 801554-001, etc.
• Use CTRL+F to search your exact model or part number on the product page

What safety and reliability features are included?

This replacement pack is assembled using quality cells and control boards that aim to meet OEM standards for safe charging and stable operation. Multiple circuit protections reduce the risk of damage to the battery and the laptop under normal conditions.

• Overcurrent and overtemperature protection built into the pack
• Anti-overcharge and anti-overdischarge circuitry to extend usable life
• Short-circuit protection for safer handling and use
• Designed for up to approximately 500 recharge cycles under normal use

How easy is installation and what warranty/support is offered?

Installation is straightforward for users familiar with removable laptop batteries: power down, remove old pack and insert the replacement. Fancy Buying backs the product with a 30-day refund policy plus a 12-month warranty and responsive customer support.

• Simple swap-in replacement for compatible ProBook battery bays
• 30-day full refund if not satisfied
• 12-month warranty and email support with 24-hour response
• Contact via the product page "ASK A QUESTION" button for assistance

Who is this for? The Fancy Buying CI03/CI03XL battery is intended for ProBook owners who need to replace an aging or failing internal battery without paying OEM premiums. It suits students, professionals and IT technicians who require a dependable, cost-effective replacement that restores full mobility and preserves daily productivity while offering standard safety protections and manufacturer support.