NinjaBatt Battery for HP 8440P 6550B 8440W TD06 486296-001 6540B 6530B

So i tried to buy some used oem batteries from the strore for my hp laptop and had to return both of them, i guess all oem hp batteries are too old, and also another extended battery i got lasted only a year until it got swollen for no reason and charged only to 75 percent. I was going to get rid of the 8440p laptop sinceIt was old but wanted to give it one more try. This battery charged to 100 percent and lasted very long. It is the best aftermarket HP battery that can be bough. 5 stars for now, if anything changed within a year i will update my review.

The battery on my HP Pavilion finally died requiring its replacement. I chose the Ninja battery based on it many positive reviews and have not been disappointed. I did read the one and two star reviews as I always do so was prepared should there be issues. The battery fit perfectly, and I followed the initial charging program as closely as possible. Everything is flawless so far, but I can't attest to life expectancy yet. One caveat: because the battery is not OEM the computer does not recognize it as being installed. That doesn't affect its operation or condition display at all though. I am very happy with this purchase. I feel it is a very good value

Worked great.

The product fits my older HP laptop and seems to be a good battery. I started getting the message that my old battery was no longer holding a charge so I purchased this battery as a replacement. It does fit properly and works well. I do feel the battery life is not as long as my older aftermarket battery but it does the job. Once charged and my computer laptop while on stand by it holds the charge for about a day. When using the laptop, it drains in a few hours. My old battery seemed to last much longer on both stand by and while in use. Hopefully this will will last several years like my old aftermarket one did. Overall I'll give it a 3-4 star battery.

Fit perfectly and charged fully. Would buy again.

Works fine. Does the job!

Work great for about the first five full charges. Don’t use my laptop much went to use it the other day had a full charge when it was put away opened it up and it was dead. OK, maybe I left it on. Nope tried to charge. it took all day to get 89% Left unplugged. It came back and fully dead again bad batteries do not buy.

This battery is awesome. After charging as recommended it seems to last forever for my laptop.