About HP 15 Ink Cartridges – Black (C6615DN) & MICR
Castle Ink sells remanufactured HP 15 black ink cartridges (C6615DN) and an HP 15 black MICR cartridge for printing checks. HP 15 is a black-only cartridge; the matching tri-color for most of these printers is HP 78. They fit the HP DeskJet 810c, 812c, 825c, 840c, 841c, 842c, 843c, 845c, 916c, 920c, 940c, 948c and 3820; OfficeJet V40, V45, 5105, 5110 and 5110xi; PSC 500, 720, 750, 760, 950; and Fax 1230. Each cartridge is a remanufactured original shell, refilled and tested in the U.S. Orders placed by 4 PM ET ship the same business day, shipping is free over $50, and every cartridge is covered by our 1-year 100% satisfaction guarantee.
Firmware note: HP firmware updates can block cartridges with non-HP chips. Our cartridges reuse the original HP chip where one is fitted, and we recommend turning off automatic firmware updates (here's how). Printing checks? Choose the MICR black version where offered.
HP 15 Ink: Common Questions
How many pages does HP 15 print?
HP rates the 15 black (C6615DN) at about 500 pages at 5% coverage.
Which color cartridge goes with HP 15?
Most HP 15 printers use HP 78 tri-color (C6578DN). Check the label on your old color cartridge; a few older DeskJets pair 15 with HP 17 or HP 23 instead.
Which printers use HP 15 ink?
HP DeskJet 810c, 812c, 825c, 840c, 841c, 842c, 843c, 845c, 916c, 920c, 940c, 948c, 3820; OfficeJet V40, V45, 5105, 5110; PSC 500, 720, 750, 760, 950; Fax 1230. Our Find Ink by Printer page has a guide for each model.
Will remanufactured cartridges void my printer warranty?
No. Under the U.S. Magnuson-Moss Warranty Act, HP cannot void your printer warranty just because you used third-party ink or toner. If a cartridge from us ever isn't recognized or prints poorly, contact us and we'll replace or refund it under our 1-year guarantee.
More help: All HP ink cartridges · Find Ink by Printer. Updated October 2026 by William Elward, founder of Castle Ink (in business since 2005).
