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Previously bought another brand of battery off of Amazon that lasted 45 days before failing. This one's been going for 5 months now with no issues. Gets left in a service truck in a work laptop with fluctuating summer and winter temps. Holds charge great. Would and will repurchase when the time comes.

I ordered the battery for my laptop which had been sitting, for a young family member who is going back to school. Had to be there quickly and it was! Snapped it into the laptop , turned it over and turned it on and the battery worked exactly as it should have. It was about half charged, and a good night's charge and the battery was up to 100%.The best surprise is no surprise!

4/12/2017 - First review ever on amazon, so that should tell you how I'm impressed with this product. Installed battery in Dell Laptop 15R 7520. Replaced the original 4 year old battery which was holding maybe 40min of charge if that. With this new battery from NinjaBatt Im getting 3-3.5hrs of charge right out of the box. To break in a new battery they suggest letting the battery run out of juice completely then charge it overnight and repeat 2 more times...I will update this review later to comment on longevity. Paid for this item and not a bias review06/13/2018 - A year later and this battery is still going well but the battery life has decreased from my original review. I currently can get 2 hours of unplugged battery time instead of 3-3.5 hours out of the box from my first review... a little less if I'm doing intensive work. I must admit it is still better than my original battery time when i replaced it which was 30-40min at most. I have taken away one star for this updated review. Note the price has dropped 10bucks since I originally bought it a year ago so I still do recommend this battery.

I have a Dell Latitude E6540, it was given to me by a friend for free but the battery was almost finished when I got it. I would get at most 15 min from the extended battery. Finally it gave out completely and I ordered this battery as replacement.I wish I did that sooner. I'm an adult working a full time job, paying a mortgage and going taking online classes so my time to get things done is limited as it is. I did not realize how freeing it is to be able to just open my laptop and go. Having to keep my laptop plugged in and finding a place to work that was close enough to an outlet was aggravating to say the least. I get a few hours of life out of the battery on a full charge when I'm using my laptop but in sleep mode I have yet to open my laptop up and find the battery dead already, even when i go a few days without using it.I'm only a few weeks in but I have considered buying another to keep as a spare just in case the current battery is damaged or I just need to keep my computer up while on the go. I will definitely consider buying more products from this brand in the future.

Not worth the money. Installed in a Dell E6440 laptop. Battery fits perfectly, recognized by Bios, and has reasonable battery life, but it doesn't work correctly with the Dell power management system. I've had lots of problems when the machine is plugged into power adapter. The system will fail to recognize battery, gives report that battery level is critically low and then shuts down. This occurs most often when laptop is switching from charging battery to just running on power adapter, but I've had it occur at other random times as well. Machine shuts down abruptly. This happens in either Windows or Linux. Doesn't happen with battery removed. Frustrating because it seemed OK for a couple of weeks, and now seems to be getting worse and worse.

My laptop is several years old. The battery would not hold a charge longer than 5 minutes. Super easy install - pop out and pop in. All works like new and the price is reasonable. Very Happy.

Well, the battery appears to be an exact match of the OEM one I'm replacing, but the fit was not perfect. Rather than easily dropping into the battery compartment, it took a bit of force to latch the two side clips. Once installed, it did not want to be removed, so a letter opener was required to pry it out. It does appear to charge correctly and I suspect I won't remove the battery again for another five or so years. By that time, this laptop will likely be donated to the Smithsonian Museum as the oldest active laptop.

Purchased this battery 6/15/16, as of few weeks ago it only lasts for 20 to 30 min. and when it warns you of low battery ..you better plug in to charger quickly or it shut down within sec...I have taken great care to let battery discharge and re-charge it per instructions. Not happy at all with this product at all. If could it would of got a BID ZERO ( 0 ). DO NOT WAIST YOUR MONEY...I WILL BE BUYING A DELL BATTERY !!! 05/18/2017 received new battery from this company, because mine was under warranty. This Co. e-mailed me that they would back-up their product and reminded me that battery was still under warranty. In a few months I will judge this battery again...that is why I am only giving a 3 stars. I hope in 8 to 12 months that I will be giving this product (5 STARS) We will see.!!! I thank you for sending me a NEW battery at no charge. Paul,.... WELLLL it has been over an year since I received the replacement FREE battery and it has been functioning like it supposed to. I am very happy with this product, so I came back like I said I would to give a great rating. Thank You !!!