HP OfficeJet 6820 Ink Cartridges
Your HP OfficeJet 6820 uses the 934 / 934XL / 935 / 935XL ink cartridge series. This four-cartridge system relies on individual black, cyan, magenta, and yellow tanks, which is ideal for a small business environment where colour usage fluctuates. Most users find the black ink depletes at twice the rate of individual colours, making the high-capacity 934XL black a more practical choice to prevent frequent mid-project replacements. Transitioning to XL cartridges across all slots is the standard move for those moving beyond occasional document printing into regular report generation.
How long these cartridges last in real use
The 934 and 935 series are rated using the ISO/IEC 24711 standard for inkjet yield, which involves continuous printing of a five-page suite until the cartridge is exhausted. In a small office setting, your actual number of prints will vary depending on document coverage. For example, a page with heavy graphics or letterheads will consume ink faster than standard double-spaced text. Generally, the XL versions offer more than double the output of standard cartridges, providing a much more stable workflow for high-volume document runs.
| Cartridge Number | Type | Colour | Page Yield | Cost Per Page |
|---|---|---|---|---|
| 934 | Standard | Black | 400 | $0.12 |
| 935 | Standard | Cyan | 400 | $0.071 |
| 935 | Standard | Magenta | 400 | $0.071 |
| 935 | Standard | Yellow | 400 | $0.071 |
| 934XL | High Yield | Black | 1,000 | $0.089 |
| 935XL | High Yield | Cyan | 825 | $0.066 |
| 935XL | High Yield | Magenta | 825 | $0.066 |
| 935XL | High Yield | Yellow | 825 | $0.066 |
Cost Per Page = Total Cartridge Price ÷ Page Yield (at 5% coverage). Prices based on Genuine cartridges.
Choosing between genuine and compatible options
We provide both genuine HP supplies and premium compatible alternatives for this printer. Under Australian Consumer Law, using compatible cartridges does not void your printer warranty. You can read more about your rights and the differences between these options in our genuine vs compatible guide. Our compatible 934XL and 935XL range is designed to match the fit and function of the original units, ensuring your OfficeJet 6820 continues to operate without recognition errors.
Choosing the right cartridge setup
If you primarily print text-based invoices and emails, we recommend stocking up on 934XL black cartridges. For those producing marketing materials or colour-heavy presentations, the multi-packs or bundles are the most cost-effective way to manage your inventory. If you choose to trial our compatible range to reduce overheads, please note they come with a money-back guarantee for your peace of mind. For more information on our satisfaction promise, please view our returns policy.
Free delivery applies on all orders over $99 (conditions apply). To ensure prompt arrival, we ship directly from our distribution warehouses located in Brisbane, Sydney, Melbourne, Adelaide, and Perth. Explore our full range of HP ink cartridges for other models in your office.
Pro Tip
Always keep a spare 934XL black cartridge on hand. The OfficeJet 6820 is designed to stop printing if the black tank is completely empty, even if you only intend to print a colour document, to prevent air from entering the printhead delivery system.
Frequently Asked Questions
Can I use a 934XL black cartridge alongside standard 935 colour cartridges?
Yes, the OfficeJet 6820 allows you to mix and match standard and XL capacities. The printer hardware recognises each slot independently, so you can prioritise high capacity for the black ink while keeping standard tanks for colours you use less frequently.
Why does my printer show 'Low Ink' when there is still visible liquid in the cartridge?
HP 934/935 cartridges use an internal chip to estimate ink levels based on droplet counts. The "low ink" warning is a preventative measure to ensure the thermal printhead does not fire while dry, which could cause permanent hardware damage. It is usually best to replace the cartridge once print quality begins to fade.
Will my OfficeJet 6820 accept compatible 934XL cartridges if I have a firmware update?
Our compatible cartridges are fitted with the latest version chips to maintain compatibility with current firmware. If you ever encounter a 'Cartridge Problem' message after a printer update, our technical team can assist as part of our compatibility guarantee.
