8858X T54FJ Laptop Battery Replacement for Dell Inspiron 14R 4420 5420 5425 7420 15R 4520 5520 5525 7520 17R 4720 5720 7720 Latitude E5420 E5430 E5520 E6420 E6430 E6440 E6520 E6530 Vostro 3460 3560

When my vintage (circa 2012) laptop computer's battery finally died, I ordered and installed this replacement. It was a perfect fit and snapped right in after I had turned off my computer for the night. The next morning, my laptop's screen showed that it now has a full two hours of battery life again after charging overnight.

Very good battery to bring the Dell laptop back to life and charged up fast and keeps the computer running smoothly.

Tried it on Alienware M15 R4. Battery works and the max battery time I see on my laptop is now 2 hours.

The battery fit well and works. The only issue is you have to transfer the old cable to the new battery. Removing the cable is straight forward on the PC side, but on the battery side you need to use two small pick tools and lift straight up on the connector. No instructions or info I could find on the web for this connector removal.

Worked great for 1/3 dell price. Came with tools. Ran battery report on command prompt and 100 percent

Perfect fit for our Lenovo Yoga 3 Pro laptop where the battery was suddenly no longer holding a charge. Have been using it daily for almost 6 months and there has been no perceived degradation in performance. It is the same capacity as the original battery, so you don't really get any "extra" charge, but it is a perfect replacement if you need to replace your battery. Note that in order to get into the laptop, you have to use a Torx T5 screwdriver on the bottom plate. It is very easy to open and the battery is the first and most obvious and immediate thing to change. There are a few very small Phillips-head screws holding the battery in place on the laptop, and a small connector clip which you remove. Then you just connect this new ZTHY battery, screw on the brackets, screw back on the bottom plate, and plug it in to charge it up. I think I made sure to let it charge all the way down first, then all the way back up, and ran the Windows built-in battery calibration tool. I do not use the Lenovo battery optimization software on this laptop -- I have seen many reports of it actually causing lifespan and charging issues for people and I have removed it a long time ago.

Good price but did not last like original battery.

This was so easy to install on my old "back up" Dell Inspiron laptop. It came almost fully charged and was recognized immediately! It holds a charge far better than my brand-new HP laptop! I am very impressed.