We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Rectangular black lithium-ion laptop battery with four cells and label showing 14.8V 40WH

FOCUSTEC

FOCUSTEC M5Y1K 14.8V 40WH 4-Cell laptop battery

SKU CH-5FCW-8YX9S

A 40 Wh lithium-ion replacement battery rated at 14.8 V with four cells, compatible with Dell Inspiron 14, 15 and 17 3000 and 5000 series laptops

  • Battery TypeLithium-Ion
  • 8 V lithium-ion chemistry provides stable power
  • 40 Wh capacity supports extended mobile use
  • 4-cell design balances runtime and weight
  • 500-plus recharge cycles deliver long service life
  • CE, FCC, RoHS and UL certified for safety compliance

40 Wh Li-ion replacement for Dell Inspiron

This 14.8 V lithium-ion pack delivers 2600 mAh across four cells. It fits a wide range of Inspiron 14, 15 and 17 models including the 3000 and 5000 series, plus select Vostro and Latitude units. The battery is supplied new and meets CE, FCC, ROHS and UL certification standards.

Replaces original Dell packs such as GXVJ3

Swapping a depleted or swollen original restores full mobility without adapter dependence. The upgrade is worth it when the existing pack no longer holds a useful charge or shows physical deformation. Compatibility covers dozens of part numbers listed by the manufacturer.

Limited to 14.8 V 40 Wh form factor

The pack cannot be used in laptops requiring a different voltage, capacity or connector layout. It is not suited for ultra-thin models that use custom-shaped cells or proprietary smart-battery protocols. Buyers needing higher capacity or a different voltage must seek an alternative design.

Highlights

  • 8 V lithium-ion chemistry provides stable power
  • 40 Wh capacity supports extended mobile use
  • 4-cell design balances runtime and weight
  • 500-plus recharge cycles deliver long service life
  • CE, FCC, RoHS and UL certified for safety compliance

Specifications

Battery TypeLithium-Ion

Questions about this item

Does the M5Y1K fit the original battery bay on a Dell Inspiron 15 5558 without modification?

Yes, the M5Y1K is listed as a direct replacement for the Dell Inspiron 15 5558 and matches the original 14.8V 40WH 4-cell form factor.

What is the correct order for connecting the battery cable and securing the M5Y1K during installation?

Insert the battery into the bay, press until the latch clicks, then attach the connector; reversing the order can leave the cable unseated.

How many recharge cycles does the manufacturer rate the M5Y1K for before replacement is recommended?

The manufacturer rates the M5Y1K for 500+ recharge cycles over the life of the battery.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.