40Wh XCMRD 14.8V Battery for Dell laptop Inspiron 3521 15 3000 Series 15 3531 3537 5521 5537 3542 3543 3541 17 3721 3737 17R 5737 5721 14 3421 5421 3437 3443 Latitude 3440 3540 P28F P40F P26E T1G4M

Bought two for our laptops and they are working great. Appear to be exact replacement.

The battery in my son's Dell Inspiron 5565 was showing as bad via various Windows messages. Rather than toss the laptop I decided to try swapping the battery. Did some online research and came upon this battery. It was easy to follow the instructions to swap it out and even came with the screwdrivers needed to get the laptop and battery apart. I was finished with the job in about 10 minutes. Plugged in the laptop and booted it up and bingo... no more bad battery messages. Here we are months later and still going strong.

Bought a few months ago and the battery quit after 4 months. The seller reached out to me after I left a review. This is where customer services is top tier. The seller refunded me for the original purchase of the battery and shipped me a new one for free, I just installed it and it is working great. Thank you!

I bought the first aftermarket battery for the Dell Inspiron 13-7378 2-in-1 Laptop I'm on now back in January of 2021, so it's lasted just over a year & a half. However, I should have replaced it 4-5 months ago & I'll explain why it's best not to squeeze every bit of life out of these batteries... With these Inspiron 7378 laptops, because of where the battery is located at, when they get to the point where unplugging the charger means your laptop will just die in like 5-10 minutes, if you allow them to get to that point, &/or worse, you may start to have sudden shutdowns & rebooting issues. Also these batteries will swell up & can start to leak. The Inspiron 7378 I'm on now started doing both, and even with the charger connected, it would shutdown, and then reboot. Since the cost of these batteries are inexpensive compared to a OEM Battery, and because it only takes about 1/2 hour to 45 minutes or so to remove the Bottom Panel, ( 9 screws ), unplug, remove & replace the battery, ( 4 small screws ), then put the Bottom Panel back on & you're good to go. If you haven't experienced disassembling one of these laptops, then just go online & in the search-box just put int the make & model & ''How To Disassemble''.... You might end up spending more time watching a video, or videos than it takes to replace the battery. It's the first time buying a battery from this seller but with aftermarket batteries, they're all pretty much the same quality, I mean they're just a small 3-Cell Battery & the Cells are all the same size so..... I can't think of too much more to say other than I never buy insurance for batteries. As long as I can get at least 6, 7, 8 months out of one, it wouldn't bother me one bit to replace it.. Take care & If You Decide To Replace Your Battery, Don't Worry, It's Really Easy.

Great price easy to install and also hp battery check software acknowledge the state of battery on scan test. About 6 months of good battery performance so far. UPDATE: expect low battery health in less than a year. My battery health is 20%. Cannot recommend.

This battery is well made, fits perfectly...and it includes some of the tools you need to actually get to the internal battery area (a very nice touch!). Note that, like any internal laptop battery, after you replace it your laptop will complain the first time you boot it that CMOS memory checksum is wrong. This is totally to be expected, as the main battery IS the CMOS battery. You'll want to go into the BIOS settings (push F10 immediately after you power on) and check that everything (including date and time) is what you want...as soon as you reboot, all will be well. Also note that if you leave your laptop plugged in all the time (you never discharge the battery), after 10 months or so it will look like it's discharging a bit. This "drift" is harmless: just run your laptop for an hour or so on battery, then plug it back in. The battery will return to 100% charge.

Edit 2: Removing the sticker reveals three 515974HV-N cells. The datasheet (search it) specs these at 3600mAh, NOT the 4835mAh as advertised. Probably same as all other vendors are doing, can't speak for them, but be advised you're getting 34% less capacity than what you're being sold. This explains the reviews complaining about subpar battery life. It's a common tactic that I've found with most replacement batteries (except Anker, who doesn't sell this particular battery) on Amazon and eBay. Also, my battery has a strong chemical smell after being stored in its replacement's box until I had time to deconstruct it safely. That's more dangerous than a puffy battery, as it indicates one or more battery cells are not properly sealed. Edit: 14 months in, dead as a doornail. As soon as the power is unplugged, the laptop dies. Really disappointing, as it worked so well at the beginning. Original: OEM battery was swollen, and had just a few minutes of life. This dropped in directly, and works fine. I typically keep my laptop plugged in, and only unplug to move. 6 months later it's still working as it should.

I was doing a routine cleaning and noticed the dreaded battery bulge. I went online, saw this replacement and ordered it. It arrived with instructions and even tools. Replacement took less than 10 minutes, and battery life is the same as the OEM one when I first got the laptop.