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Black rectangular lithium-ion laptop battery with label showing 14.8V 40Wh M5Y1K

Dell M5Y1K 40Wh 14.8V Li-ion Laptop Battery

SKU CH-5XVY-KMV89

Replaces Dell Inspiron 14, 15 and 17 batteries with a 40Wh 14.8V lithium-ion pack

  • Battery type96 W
  • Battery voltage rating20 V
  • Power adapter voltage20 V
  • Power adapter wattage85 W
  • Measurements14.33 in W × 12.83 in H × 9.06 in D
  • Product colorBlack
  • 40Wh capacity supports longer unplugged sessions
  • 8V lithium-ion chemistry delivers stable power output
  • Four-cell design keeps weight to 283 grams
  • Replaces Dell part numbers including M5Y1K and P51F
  • Fits Inspiron 15 3000 and 5000 series models

Compatible Dell Laptop Battery

This 40Wh lithium-ion battery replaces the M5Y1K pack in Dell Inspiron 14, 15 and 17 models from the 3000 and 5000 series. It fits machines such as the 3451, 3552, 5558 and 5759 as well as Vostro 3458 and 3558 units. The four-cell design delivers 14.8V and 2600mAh for direct drop-in installation.

Voltage and Capacity Limits

The pack supplies 14.8V, which matches the original specification for the listed Inspiron and Vostro chassis. It cannot be used in systems that require a different cell count or voltage such as 20V configurations. The 40Wh rating defines the total energy available per charge cycle.

Runtime Expectations

A 40Wh capacity typically powers mainstream 15-inch laptops through several hours of office work or video playback. Heavy workloads such as sustained gaming or rendering will deplete the charge faster. The battery is not suitable for users who need all-day operation without access to mains power.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $35.99
Pricier than about 64% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameDELL
Model name40 Wh Type M5Y1K 14.8 V
Part number40 Wh Type M5Y1K 14.8 V
Product colorBlack
Product typeCharger
Power
Battery type96 W
Battery voltage rating20 V
Power adapter voltage20 V
Power adapter wattage85 W
Size & build
Measurements14.33 in W × 12.83 in H × 9.06 in D
Product weight283 g

Questions about this item

Should I pick the 40Wh M5Y1K or a higher-capacity option for my Inspiron 15 5000?

The M5Y1K delivers 40Wh at 14.8V with 4 cells and 2600mAh; no higher-capacity version is listed for this part number.

What does the 40Wh rating actually give me in daily use on an Inspiron 14 5000?

At 14.8V and 2600mAh the pack stores 40Wh, which typically powers a mainstream Inspiron 14 5000 for several hours of mixed office work before needing a recharge.

Does the battery use a proprietary Dell connector or a standard interface?

It fits the original Dell M5Y1K bay connector used across Inspiron 14, 15 and 17 3000/5000 models listed; no universal USB-C or other standard interface is involved.

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