HP Deskjet 850c 850k Ink Cartridges
Your HP Deskjet 850c and 850k printers use the HP 45 ink cartridge series. Ink Depot has been supplying reliable consumables for these printers since Aug 2026. Built for dependable monochrome document production, these classic deskjet models rely on high-capacity black ink for clear text output. Switching to compatible 45 (51645AA) black cartridges provides a substantial reduction in printing costs for routine paperwork. Our 4.8 Google rating reflects a long-standing track record of premium cartridge performance.
Expected page output and replacement cycles
Page yields for HP 45 (51645AA) black ink cartridges are measured in accordance with standard ISO/IEC testing guidelines based on 5% coverage per A4 page. Actual ink consumption varies depending on font size, line density, and document complexity during routine text printing.
| Cartridge Number | Type | Colour | Page Yield | Cost Per Page |
|---|---|---|---|---|
| 45 | Standard | Black | 883 | $0.15 |
Cost Per Page = Total Cartridge Price ÷ Page Yield (at 5% coverage). Prices based on Genuine cartridges.
Choosing between genuine and compatible options
Selecting between genuine HP and high-quality compatible 45 (51645AA) cartridges depends on your budget and print frequency. Compatible cartridges deliver high text clarity at a fraction of the cost per page. Under Australian Consumer Law, using compatible cartridges does not void your printer warranty. Read our comprehensive genuine vs compatible cartridges comparison guide to evaluate which option best suits your printing volume.
Best way to stock these cartridges
For everyday text documents, compatible 45 (51645AA) cartridges offer maximum cost efficiency. If you require original manufacturer ink for archival records, genuine HP options remain available. All compatible items are backed by our money-back quality guarantee, detailed in our returns policy. We dispatch directly from distribution centres in Sydney, Melbourne, Brisbane, Perth, and Adelaide for prompt delivery nationwide. Free delivery applies on all orders over $99. Order your HP ink cartridges today to keep your office supplied.
Pro Tip
The HP 45 (51645AA) cartridge integrates the printhead directly into the cartridge assembly. Replacing the cartridge installs a fresh printhead every time, eliminating permanent printhead clogs on older printers.
Frequently Asked Questions
Do the HP Deskjet 850c and 850k use the exact same ink cartridges?
Yes, both the HP Deskjet 850c and 850k share the exact same cartridge system and use the HP 45 (51645AA) black ink cartridge.
What is the benefit of an integrated printhead on the HP 45 cartridge?
Because the printhead is built into the base of the HP 45 (51645AA) cartridge itself, replacing an empty cartridge completely refreshes the ink firing nozzles, maintaining sharp print quality on older printer models.
How should spare HP 45 ink cartridges be stored to prevent drying out?
Store spare HP 45 (51645AA) cartridges sealed in their original protective packaging at room temperature, away from direct sunlight, until ready to install.
Can I install a compatible HP 45 cartridge directly without modifying my printer settings?
Yes, compatible HP 45 (51645AA) cartridges share the same physical shape and contact points as genuine cartridges, allowing direct installation without any printer adjustments.
