XCMRD 40Wh Li-ion Battery 14.8V Compatible with Dell Inspiron 14R 14 17 17R 15 15R 3000 5000 3521 3543 3421 5721 5537 17-3721 15-3537 3521 5537 5521 N121Y Y1G4M 312-1387 XRDW2 YGMTN,Latitude 3440 3540

I am certainly learning about batteries and how they must be "calibrated" in order to perform anywhere close to specifications. I purchased this battery to replace the one in my Dell Latitude 7490. The old battery would show 70% or so remaining and the computer would just suddenly die...not shut down...just die.Installation: There are some good videos online on how to do this and some tools were provided with the battery. In my view, a guitar pick or some other thin plastic (maybe the corner of an old credit card) is necessary to help pry the bottom of the case open after removing the screws. Watch more than one video on this to fully understand the process. The actual replacement of the batter is easy once the bottom of the computer is off.I installed this battery and let it charge a bit and then shut the computer down, pulled the AC adapter out and started the laptop with just the battery. The computer booted and about 3 minutes after logging into Windows 10, the computer died! What's going on? That's when I determined that the issue must be calibration. I restarted the computer with the AC plugged in and after the battery was at 100% I unplugged the AC and set the computer to NEVER sleep or shut off the display while on battery. I left it that way all day and did various business related tasks (accounting software, Emails, some web surfing, etc.) off and on. Some of that 9 hours the computer just sat there not being used but on, with the screen lit. It took nearly 9 hours for the battery to reach 6% and then the computer shut down into hibernation. I plugged in, allowed the battery to completely recharge, and then repeated the process. Now the computer will boot and run on battery alone and I have a very long battery life (up to 8-9 hours or more if I use all of the battery saving protocols). I am very pleased with the battery and recommend it. I also recommend, as does the battery manufacturer, that any laptop battery be periodically calibrated as I described.

It was a great fit and works great.

Bought for a friends Dell laptop. It was very reasonable and holds the charge as a battery should.

So i ordered this on July 3rd and after a few delays i finally got it on July 15th.. Id like to state that this in no way or means is the fault of the seller. Anyway the battery came neatly and securely packaged and was a breeze to install on my Dell Inspiron 15 3537 computer. The battery was flawless and powered up my laptop after months without a battery. I would like to also state the seller had contacted me by email (before the battery arrived, to see how it worked out and to offer any assistance if needed, which is a pleasant surprise and was much appreciated). I would recommend this Seller TCORE for battery replacement if anyone needs it. They are in my opinion one of the best out there.UPDATED REVIEW-After a few months of solid use this battery is no longer working, the funny thing is my computer is telling me that the battery is healthy and has a full charge but when I unplug it from my computer it shuts down. I've tried everything possible to remedy the situation but I get the same result, I've was going to contact the seller but it's already past the return window. So my suggestion is to go buy a genuine Dell battery from the manufacturer and skip this product

Battery fits the computers, works with the computer and after several charging cycles has displayed it's functionality. Can't say much more.

Perfect fit!!

el producto vino defectuoso tiene la especificación debida, pero la laptop no la reconoce.

Great replacement battery for the price. Pay attention to the directions. This battery came out of the package with 60% charge. In my Dell Inspiron laptop, the battery wouldn't charge it. The battery needed to be calibrated...meaning use it normally (unplugged) and allow the battery to discharge down to about 5%...then plug it up and allow it to charge to 100%. After that, it was good to go.