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The IEFUU M5Y1K is a high-performance 40WH lithium-ion laptop battery designed for Dell Inspiron 14, 15, and 17 series. Delivering stable 14.8V power and over 500 recharge cycles, it offers reliable, long-lasting energy with full compatibility and certified safety standards, making it the smart choice for professionals seeking dependable mobile productivity.






















| ASIN | B079GSFM67 |
| Amperage | 14.8 Amps |
| Antenna Location | Laptop |
| Battery Capacity | 2600 Milliampere Hour (mAh) |
| Battery Cell Type | Lithium Ion |
| Battery Weight | 0.49 Pounds |
| Best Sellers Rank | #65,669 in Electronics ( See Top 100 in Electronics ) #918 in Laptop Batteries |
| Brand | IEFUU |
| Compatible Phone Models | M5Y1K Laptop |
| Customer Reviews | 4.1 4.1 out of 5 stars (2,652) |
| Item Dimensions | 11.9 x 2.7 x 1.2 inches |
| Item Weight | 0.13 Pounds |
| Manufacturer | DongGuan Simer Electronics Co.,LTD |
| Model Name | M5Y1K |
| Model Number | M5Y1K |
| Number of Batteries | 4 Lithium Ion batteries required. (included) |
| Reusability | Rechargeable |
| UPC | 712145958930 |
| Voltage | 14.8 Volts |
| Warranty Description | 1 year |
D**L
Wow, great product fit perfect
Thku, thku, it fit and works great. Holds a long charge. Just as good as OEM battery.
R**D
The battery worked.
The battery worked fine of my Toshiba. But then it stopped working just like the OEM battery. The problem was not with the battery, but with the laptop. To this day, it just remains plugged into the way wasting electricity. Not the battery fault, just the cheap poorly made laptop is the issue.
C**R
I almost made the mistake of buying another one - UGH
I came back to this page looking for a new battery for a user laptop. I just replaced it on Wednesday and the user has the same problem mentioned in this other review. Keith Barrett's Review - "it fits into the laptop as expected, works fine if it is not charging. BUT if you plug the laptop into the docking station, or hook up the charger, it will randomly throughout the day get a battery failure and put the laptop into hybernation and you have to boot back into windows. you can be right in the middle of typing an email and suddenly the computer will shut down" This is the exact issue I had with my user at work. I will be buying something else as I had it in the server room for over a year before I used it anyway. Even though this appears to be more than I stored it too long. I have a few batteries I purchase in multiples to have on hand and I have never had this type of issue with any other laptop battery I have purchased on Amazon. Don't waste your time or money.
A**M
It worked as a battery, but there are problems.
First, it snapped into my e7440 just fine, no problems with fit. It does power up and it runs the laptop for a while and seems to work just fine as a battery. However, now my laptop shuts down while sleeping / hibernating. It'll sleep for an hour or so, and then I will look at it and it will have turned itself off, so whatever I may have been doing before it went to sleep is gone. With my previous battery, I could shut the lid, put it in the backpack, pull it out 2 days later and wake it up right where it was. Not with this battery. Nothing else changed. I do occasionally get errors when the laptop is on the docking station that the battery is not working / not charging, but take it off of the station, plug it in, and it works fine. I don't know. I just needed a battery, and the genuine Dell that I ordered from Dell won't be here for another 6 weeks, so I got this one to run with while I wait. I need my laptop to be portable and need it now, so yeah, it works, it just doesn't work well with sleep / hibernate. Looking forward to the genuine Dell battery to get here. Editing my review: Suddenly (after a week of use), sleep mode is working. Laptop stayed asleep all night last night and woke up fine after taking out of my backpack. Perhaps something doesn't make good contact sometimes - I was messing with the old dead battery and taking this one in and out. So I have changed my review from 2 to 4 stars. It's working. For now, but I don't trust it, hence minus 1 star.
S**.
Easy swap
Kept my aging laptop alive until at least the end of the semester. Extremely easy to install
C**S
Best purchase!
My battery on a laptop went and I barely used this laptop. I knew I needed to to updates but battery kept putting me I to hibernation mode. Dell wanted to charge me 199.99 for extended warranty and 39.00 for them to just see what's wrong with my battery plus give me a refurbished one shall I needed one as well send this laptop in the mail. I decided to take a chance and order a battery here with the MY51K battery. I was nervous but it fit like a charm and worked. Very grateful. Only thing I regret is not ordering 2 just in case so I shall be ordering a second one. This saved me a lot of money.
J**E
It's nice to have my "old" computer back.
My original battery was simply done. It's nice to have a quality battery again where I can "Unplug" for more than 15 minutes. In fact, it's been a couple of weeks now with regular use and the life has been over three hours before I plug back in and it's about 35% when I do. I don't like to drop it down too far as my own preference so as not to stress the battery or the computer charging system. So in a pinch I know I can last for half a business day, full on. One added note is that I tend to operate my laptop with the screen brightness reduced to about 80% to extend the battery life.
T**T
works just like the factory dell battery with no problems
like others I was worried it wouldn't work with my dell or have to go through tons of ways to boot it up to work, but I just kept my power cord plugged up and removed the factory battery and put this one is and works great so far with a month in. The battery life is a little less than the factory one was when new but for the price you can't go wrong this battery lasts about 2 1/2 hours to 2:45 minutes life before plugging back in and takes about 1 1/2 hour to fully recharge but that's also with 3 or 4 more open programs running so with just 1 program running you will easy get over 3 hours or more out of it. compared to the price of a factory battery it's a no brainer to go with this.
F**O
Appena messa in servizio, fa il suo.
M**I
Fitted the battery a few days ago, so far works Well
C**N
J'ai bien reçu mes commandes et suis très satisfait
A**R
This battery has worked better than expected. It lasts more than 4 hours on my Dell which is quite sufficient at this price. The only negative is that it doesn't fit as nearly on the back as the original one.
A**K
Esta batería para portátil es estupenda. Su instalación fue rápida y sin complicaciones, encajando perfectamente en mi dispositivo. Desde entonces, su rendimiento ha sido impecable, proporcionando más de tres horas de autonomía continua con cada carga. Lo mejor de todo es su precio, que es increíblemente asequible para la calidad que ofrece. Si buscas una batería de repuesto que cumpla y supere tus expectativas sin vaciar tu bolsillo, ¡esta es la elección perfecta!
Trustpilot
2 months ago
2 weeks ago