I purchased two 61XL black print cartridges in the two pack for my 4630 HP printer. The printer works flawlessly. The warranty end date on these is Aug 2017. They both failed in a very short time. They both died up! I tried returning to the seller, but I was referred to HP customer service. Well what an ordeal trying to get replacements I had already bought new ones which are just fine. Then to add insult to injury this agent tells me my printer is at fault, but she will provide an upgraded model--------- AT A REDUCED PRICE. The traners of these agents should give a them a warning. MOST HP CUSTMERS ARE NOT IDIOTS!