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Black rectangular laptop battery with four cells and connector pins

BFKK

BFKK M5Y1K 40WH 14.8V 4-cell laptop battery

SKU CH-N58V-ANA41

40 Wh 14.8 V lithium-ion replacement battery for Dell Inspiron 14, 15 and 17 models with over 1000 charge cycles

  • 40Wh capacity powers compatible Dell Inspiron and Latitude models
  • 8V lithium-ion chemistry delivers stable voltage for daily workloads
  • Four-cell design balances runtime with a slim form factor
  • Rated for over 1000 charge cycles for long service life
  • Replaces multiple OEM part numbers including M5Y1K and GXVJ3

40 Wh Li-ion replacement for Dell Inspiron

This 40 Wh lithium-ion battery replaces the original Dell M5Y1K pack in Inspiron 14, 15 and 17 models across the 3000 and 5000 series. It supplies 14.8 V through four cells and fits the same compartment as the factory unit. The pack is new and rated for more than 1000 charge cycles.

Sustained runtime and cycle life

Under continuous load the 2600 mAh capacity delivers steady voltage until the controller cuts off, avoiding the sharp drop seen in aged cells. The four-cell layout balances current across each cell, reducing heat buildup during long sessions. Cycle-life testing confirms the pack retains usable capacity past 1000 full cycles.

Dell part-number compatibility limits

The battery matches a long list of Dell part numbers including GXVJ3, HD4J0, WKRJ2, VN3N0, 453-BBBQ, 991XP, P47F, P51F, P52F, P63F and P64G. It will not work in systems that require a different voltage, cell count or connector keying. Buyers should verify their service tag against the part-number list before ordering.

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

No published specifications for this item yet.

Questions about this item

How much heat does the 40WH 14.8V 4-cell battery generate during all-day use?

Lithium-ion cells at this capacity produce minimal heat under normal loads; the pack stays close to ambient temperature during typical office work and only warms noticeably under sustained heavy discharge.

What must my Dell laptop already have for the M5Y1K battery to fit and connect?

Your Inspiron or Vostro model must use the original 40WH 14.8V 4-cell form factor and the Dell connector keyed for part numbers such as GXVJ3, WKRJ2 or 453-BBBQ.

Will the M5Y1K work alongside the original AC adapter I kept from my older Inspiron 15 5000?

Yes — the 14.8V output matches the factory specification, so the existing Dell charger will charge the replacement pack at the same rate and voltage as the original battery.

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