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Black rectangular lithium-ion laptop battery with connector strip

FOCUSTEC

FOCUSTEC M5Y1K 40Wh 14.8V 4-cell laptop battery Type 5566 WKRJ2 P47F P63F P64G

SKU CH-XFME-T28DD

40 Wh lithium-ion pack powers compatible Dell Inspiron 14, 15 and 17 models with a 14.8 V, four-cell design

  • Battery TypeLithium-Ion
  • 40 Wh capacity powers compatible Dell Inspiron models through a full workday
  • 8 V lithium-ion chemistry matches the original voltage spec for stable operation
  • Four-cell design keeps weight to 0.56 lb for easy portability
  • Replaces Dell part numbers WKRJ2, P47F, P63F, P64G and others for drop-in fit
  • New condition with 100 % factory testing ensures reliable first-cycle performance

Replacement Battery for Dell Inspiron Series

This FOCUSTEC M5Y1K lithium-ion battery replaces original Dell part numbers including WKRJ2, P47F, P63F and P64G. It fits a wide range of Inspiron 14, 15 and 17 models across the 3000 and 5000 series as well as select Vostro 14 and 3558 laptops. The unit ships new in black and contains a single 4-cell pack.

Sustained Power Delivery

Rated at 14.8 volts and 40 watt-hours, the four-cell lithium-ion chemistry provides consistent voltage output throughout the discharge cycle. This capacity supports typical productivity workloads such as document editing and web browsing for extended periods away from mains power. The battery maintains stable performance without the voltage sag common in aged cells.

40Wh Capacity Decides Fit

The 40 watt-hour rating is the single specification that determines whether this part matches your laptop's original design envelope. Systems originally equipped with higher-capacity 6-cell or 9-cell packs will see reduced runtime with this 4-cell unit. Buyers needing longer unplugged operation should verify their original battery's watt-hour rating before ordering.

Highlights

  • 40 Wh capacity powers compatible Dell Inspiron models through a full workday
  • 8 V lithium-ion chemistry matches the original voltage spec for stable operation
  • Four-cell design keeps weight to 0.56 lb for easy portability
  • Replaces Dell part numbers WKRJ2, P47F, P63F, P64G and others for drop-in fit
  • New condition with 100 % factory testing ensures reliable first-cycle performance

Specifications

Battery TypeLithium-Ion

Questions about this item

Does the 40Wh 14.8V 4-cell lithium-ion battery run hot or draw extra power during all-day use?

The 40Wh 14.8V 4-cell lithium-ion pack is a direct replacement; it draws the same power and produces the same heat as the original Dell battery it replaces.

What must my Dell Inspiron already have for this M5Y1K battery to work?

Your Inspiron must use one of the listed part numbers such as WKRJ2, P47F, P63F or P64G and have the matching 14.8V 4-cell battery bay.

Will this 14.8V 40Wh pack work alongside the original AC adapter I kept from my older Inspiron 15 5000?

Yes, the 14.8V 40Wh battery charges normally with the original Dell AC adapter supplied with compatible Inspiron 15 5000, 14 3000 or 17 5000 models.

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