Replacement for QK645AA: Drop-In Alternatives We Stock
Looking for a replacement for the QK645AA (QK645AA - HP SX09 QK645AA Notebook Battery 8850 mAh Lithium Ion (Li-Ion) 11.3 V DC)? Pro Disk Network ships HP drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the QK645AA
| SKU | QK645AA |
|---|---|
| Product | QK645AA - HP SX09 QK645AA Notebook Battery 8850 mAh Lithium Ion (Li-Ion) 11.3 V DC |
| Current price | $208.91 |
| Stock status | In Stock |
| Detail page | View QK645AA › |
Drop-in replacements for QK645AA
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
HP PB995A#ABA 12-Cell Lithium Ion Notebook Battery Lithium Ion (Li-Ion) 10.8V DC PB995A ABA
SKU: PB995A-ABA
Price: $154.17
391883-001 - HP Lithium Ion Notebook Battery Lithium Ion (Li-Ion) 4400mAh 10.8V DC
SKU: 391883-001
Price: $159.64
PF723A - HP 4400mAh Lithium-Ion Notebook Battery Lithium Ion (Li-Ion) 10.8V DC
SKU: PF723A
Price: $166.05
367759-001 - HP Lithium Ion Notebook Battery Lithium Ion (Li-Ion) 4Ah 11.1V DC
SKU: 367759-001
Price: $200.78
191169-001 - HP Lithium Ion Notebook Battery Lithium Ion (Li-Ion) 14.4V DC
SKU: 191169-001
Price: $207.20
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.