Green Cell Dell M5Y1K battery
(9 reviews)
Giving a tired Dell Inspiron 15 another day of runtime without replacing the machine: 2200 mAh, four cells and a two-year warranty.
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Characteristics
- Capacity: 2200 mAh (14.8 V, about 33 Wh)
- Fits: Dell Inspiron 14, 15 and 17 (3000 and 5000 series)
- Cells: 4 Li-ion cells
- Safety: Overcharge and deep-discharge protection
- Original M5Y1K reference, two-year warranty
Detailed overview: Green Cell M5Y1K battery for Dell Inspiron 15
The Green Cell M5Y1K (manufacturer code DE77) is a replacement laptop battery for Dell, built to match the original M5Y1K reference, which Dell also lists under the codes WKRJ2 and K185W. It targets Inspiron 14 machines in the 3000 and 5000 series, Inspiron 15 models (3551, 3552, 3555, 3558, 3567, 5551, 5552, 5555, 5558, 5559), Inspiron 17 models (5755, 5758, 5759), and several Vostro 15, Latitude 3470 and 3570 laptops.
Capacity is 2200 mAh at a nominal 14.8 V, about 33 Wh, spread across four Li-ion cells. That is the original configuration of these machines: the aim is to restore day-one runtime, not to exceed it. On an Inspiron 15 doing office work, that usually means four to five hours depending on screen brightness and the age of the rest of the machine.
The on-board electronics are the real deciding factor on this kind of product. Green Cell states overcharge protection and deep-discharge protection, two safeguards that respectively prevent runaway at the end of a charge and premature cell death when the pack sits empty for too long. The manufacturer, based in Poland, identifies its cells and backs the product with a two-year warranty, where most replacement batteries come from sellers with neither a name nor an after-sales service.
Before ordering, the check is simple and non-negotiable: remove the old battery and read the reference printed on its label. It must read M5Y1K, WKRJ2 or K185W. The Inspiron range used several battery formats over the years and across configurations, and a neighbouring model will not sit in the same bay. The Dell service tag stuck under the machine also settles any doubt on the manufacturer's site.
On these Inspiron laptops the battery remains removable from underneath, without opening the base: two latches and the job takes less than a minute, with no tools. That is what makes this replacement so worthwhile against the cost of a new laptop.
EAN: 5902701414306
Comparison
At around 25 pounds, replacement laptop batteries are chosen first on fit, then on the stated reliability of the cells. Here is how the Green Cell M5Y1K stands against three references from our selection, for searches such as “Dell Inspiron 15 5558 battery” or “M5Y1K battery”.
| Criterion | Green Cell M5Y1K | Avizar Dell Latitude | Visiodirect Acer Aspire | Visiodirect HP Pavilion |
|---|---|---|---|---|
| Capacity | 2200 mAh | 7900 mAh | 2500 mAh | 4400 mAh |
| Target machines | Dell Inspiron 14/15/17 | Dell Latitude | Acer Aspire | HP Pavilion |
| Cells | 4 Li-ion | Li-polymer | Li-ion | Li-ion |
| Stated warranty | 2 years | Not stated | Not stated | Not stated |
| Typical price | ≈ £24 | ≈ £53 | ≈ £30 | ≈ £22 |
In short, these four batteries are not really competitors: each targets one specific machine, and the only criterion that matters first is the reference printed on your old pack. Where they do overlap, the Green Cell stands out as the only one in the group with an explicit manufacturer warranty and a named European maker, which counts on a product whose safety depends entirely on its internal electronics. The Avizar Dell Latitude plays in a different capacity class, as makes sense on newer business machines.
Related video
Video: How to Replace Battery on Dell Inspiron 15 5000 (P102f) Laptop - Step-by-Step - Published on 19/12/2022
Our tester's review: Yoni Marchal-Laporte
Replacing a laptop battery is one of the few jobs that genuinely extends a machine's life for a trivial cost, and that is exactly this Green Cell's territory. On a 2015 Inspiron 15 that barely lasted an hour, you get back half a day of office work, enough to push the replacement back by several years. Fitting is done from underneath, the battery being removable on most affected Inspiron models, with no need to open the base. What separates Green Cell from the countless unbranded packs is traceability: identified cells, stated protection circuits, a two-year warranty and a European manufacturer you can actually reach. On a product whose real risk is a cut-price protection board, that is worth the few pounds' difference. Two things to know before ordering. First the capacity: 2200 mAh is the original four-cell format, not a high-capacity pack, so expect no more than the machine had when new. Second the reference: the Inspiron range used several different batteries, so read M5Y1K on the old label before confirming.
Frequently asked questions: Green Cell M5Y1K battery for Dell Inspiron 15
Remove the old battery and read the reference on its label: it must say M5Y1K, WKRJ2 or K185W. The Inspiron range used several formats over the years, and a neighbouring model will not sit in the same bay. The service tag stuck under the machine also lets you check on Dell's site.
Its 2200 mAh at 14.8 V, about 33 Wh, matches the original configuration of these Inspiron laptops. For office work, expect four to five hours depending on screen brightness. The aim is to restore day-one runtime, not to beat it.
No. On these Inspiron models the battery is removable from underneath: two latches to slide, with no tools and no need to open the base. The job takes under a minute, with the laptop off and unplugged.
In this segment the risk is not capacity but the protection circuit. Green Cell states overcharge and deep-discharge protection, identifies its cells and warrants the product for two years, which puts it above the unbranded packs sold for a few pounds less.
Never the bin: a spent lithium battery goes to a recycling centre or to the collection bins found at the entrance of most supermarkets and electronics shops. If it has swollen, do not store it, take it in straight away.
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Published on 27/08/2026