It's NOT Amazon's fault, BUT IT IS YOURS! It should not have taken you 7 months as described, "It took 7 months to discover that the spare battery I bought will not take more than a 60% charge and is a Morewer not the HP MU06 battery I ordered".
I have been a customer with Amazon for 3 yrs and Amazon gives 30 Money Back Guarantee on EVERYTHING it sales. I have NEVER had a problem returning ANYTHING (I have EVEN gone a week past the 30-day period and STILL got a REFUND)!
1. It's YOUR RESPONSIBILITY to check your product (the batter part no. and compare it to both the HP & Amazon site info for the battery) in order to make sure you receive what you ordered, and
2. It's YOUR RESPONSIBILITY to check to make sure you battery will take a FULL CHARGE within the "30 MBG period" AFTER you received your Purchase, and
3. It's YOUR RESPONSIBILITY to either "Contact" the "Seller, Vendor or Merchant" directly or Amazon Customer Service in order to get there info, so you can complain about the product and either get a "Replacement" or "Refund", and
A. IF NOT, then Contact "AMAZON Customer Service" to complain, (Because)
4. It's YOUR RESPONSIBILITY to make sure you are FULL SATISFIED with the product within that "30 MBG period" AFTER you received your purchase.
Yes, it's Amazon's RESPONSIBILITY to make sure the customer is "HAPPY & SATISFIED" with the "Product ordered", BUT it's not their RESPONSIBILITY to check every product that their "Vendors" sale. If there are problems with a "Vendor", I believe they can and will "cut" ties with them if they receive more "NEGATIVE" FEEDBACK THAN "POSITIVE" and/ or if they "Violate" the "Agreement" stipulated in the "Merchant contract" (I'm not a Vendor so I don't know what's in it).
However, from what I see, there are over 100 Five (5) star reviews, 48 Four (4) star and 19 Three (3) star reviews compared to 28 One (1) star and 15 Two (2) reviews. Of the 210 reviews, there are 167 total positive reviews verses and compared to 43 total negative reviews.
You also should have "voiced" your disappointment with the "Seller" and "Amazon's Customer service" so they would know about the problem, so it could be "rectified", along with posting it on here (so us Consumers can read about).
Why didn't you buy a "Replacement" battery from HP instead of here, and list the name of the Vendor you got the battery from so we would know which one to avoid (because there are many vendors listed)?