Rated 
HP 51645A Black Cartridge -- A Very Reliable Product!
Lasts a long time even with the heavy use in our office printers. Never bought one that was faulty in all these years that we have used them. Better reliability than refilled and non-OEM cartridges.
I cannot think of any real weaknesses with this cartridge. Of course, a lower price would be nice, but then sometimes you get what you pay for.
Posted 1 year ago - We have two different HP printer models--the HP932C and HP1220C--which use the 51645A black cartridge in addition to the tricolor cartridges. We have always been very satisfied with them and have never had to return one due to defect. We have been using this same model (51645A) for years and really like it. In fact, when I shopped for an additional HP printer (the 1220C), I made sure the one I purchased used the 51645A cartridges. Recently, I tried a store-brand non-HP version of the 51645A and guess what it didn't work AT ALL. Had to return it to the store for a refund. Never again--I will stick with the genuine HP 51645A!
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Be careful before you decide to place an order
HP 41645a
