The T673 bottles generally contain of ink per bottle. Because the L800 is an EcoTank (refillable tank system), "yield" is measured by page volume rather than cartridge replacements.
The Epson L800 is an early EcoTank-style printer that requires a 13-digit ID code found on the ink bottle to "unlock" or refill the ink levels in the software. While modern EcoTanks often detect refills automatically, the L800 uses these codes as a security measure to ensure genuine ink is used. YouTube Common Ink Codes for Epson L800 If you are using third-party ink or have lost your bottle labels, the following verified 13-digit IDs can often be used to reset your ink levels in the EPSON Status Monitor 3 : Color Sample Reset Codes Black QJK-8M3-8SK-WE7N epson l800 ink code
– Open the ink tank cap, insert the bottle nozzle (or syringe), and fill to the indicated line. Do not overfill. The T673 bottles generally contain of ink per bottle