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Rectangular black lithium-ion laptop battery with label showing 40WH 14.8V

FOCUSTEC

FOCUSTEC M5Y1K 40WH 14.8V laptop battery

SKU CH-7EZN-NV3B4

40 Wh 14.8 V lithium-ion replacement battery for Dell Inspiron 14, 15 and 17 3000 and 5000 series notebooks

  • Battery TypeLithium-Ion
  • Replaces original Dell battery across Inspiron 14, 15 and 17 models
  • 40 Wh lithium-ion capacity delivers reliable mobile power
  • 8 V output matches factory voltage specification
  • New condition ensures full performance from first charge
  • Compatible with part numbers GXVJ3, 453-BBBQ, WKRJ2 and others

FOCUSTEC M5Y1K 40WH 14.8V replacement battery

This new lithium-ion battery replaces the original power unit in Dell Inspiron 14, 15 and 17 models across the 3000 and 5000 series. It fits a wide range of specific model numbers including 3451, 3551, 5558 and 5759. The 40 Wh capacity and 14.8 V output match the factory specifications for these laptops.

Thermals and power behaviour in daily use

The lithium-ion chemistry delivers steady voltage across typical office and web-browsing workloads without generating noticeable heat inside the chassis. Normal discharge rates keep cell temperatures low, so the laptop’s own cooling system is not stressed. Power draw remains consistent with the original design envelope.

Sustained load characteristics

Under continuous demand such as video playback or long compile jobs, the pack maintains its rated voltage until the low-capacity threshold is reached. No sudden voltage sag is introduced beyond the normal lithium-ion discharge curve. The 40 Wh rating determines total runtime rather than peak current capability.

Highlights

  • Replaces original Dell battery across Inspiron 14, 15 and 17 models
  • 40 Wh lithium-ion capacity delivers reliable mobile power
  • 8 V output matches factory voltage specification
  • New condition ensures full performance from first charge
  • Compatible with part numbers GXVJ3, 453-BBBQ, WKRJ2 and others

Specifications

Battery TypeLithium-Ion

Questions about this item

How do I install the M5Y1K 40WH battery in my Dell Inspiron 15 5558, and what step is often missed?

Power off the laptop, remove the bottom case screws, disconnect the old battery cable before lifting it out, connect the new M5Y1K cable firmly, then reassemble; the step often missed is disconnecting the cable first.

What maintenance or replacement will the 14.8V lithium-ion pack need later?

The pack is sealed and maintenance-free; replace it when run-time drops below what you need, typically after 300 to 500 full charge cycles.

What limit appears first during sustained use of this 40WH battery?

The 40 watt-hour capacity sets the runtime ceiling; under heavy load the pack will reach its discharge limit before any thermal throttle.

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