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

FOCUSTEC

FOCUSTEC 40 Wh 14.8 V XCMRD MR90Y laptop battery

SKU CH-5A08-408QS

A new 40 Wh 14.8 V lithium-ion replacement battery compatible with numerous Dell Inspiron, Latitude and Vostro models

  • Battery TypeLithium-Ion
  • Replaces original Dell batteries across Inspiron 14, 15, 17 and Latitude 3000 models
  • 40 Wh lithium-ion cell delivers reliable mobile power for daily workloads
  • Matches OEM part numbers including MR90Y, XCMRD and 312-1387 for direct fit
  • 8 V 4-cell design maintains factory voltage and runtime specifications
  • New condition ensures full capacity from first charge

40 Wh 14.8 V replacement battery for Dell laptops

This new lithium-ion pack delivers 40 Wh at 14.8 V and fits a wide range of Dell Inspiron 14, 15 and 17 models as well as Latitude 3000 series and select Vostro units. It is aimed at owners who need a direct swap for an ageing original battery.

Match the part number before ordering

The battery replaces Dell part numbers including MR90Y, XCMRD, 312-1387, 312-1390, 312-1392, P28F, P40F, FW1MN, MK1R0, PVJ7J, V8VNT, X29KD, YGMTN, 24DRM, 312-1392, 4DMNG, 6HY59, 6XH00, 9K1VP, vr9hm, G019Y, T1G4M, VR7HM, 312-1433, 4WY7C, 6K73M, 8RT13, DJ9W6 and G35K4. If your original battery carries a different code the pack will not fit.

Simple swap but verify the connector first

Installation requires removing the bottom case screws, disconnecting the old pack and plugging in the new one using the same multi-pin connector. The most common issue is a keyed connector that looks identical but is offset by one pin, so compare the plug orientation carefully before applying force.

Highlights

  • Replaces original Dell batteries across Inspiron 14, 15, 17 and Latitude 3000 models
  • 40 Wh lithium-ion cell delivers reliable mobile power for daily workloads
  • Matches OEM part numbers including MR90Y, XCMRD and 312-1387 for direct fit
  • 8 V 4-cell design maintains factory voltage and runtime specifications
  • New condition ensures full capacity from first charge

Specifications

Battery TypeLithium-Ion

Questions about this item

How long will the 40 Wh capacity run my Dell Inspiron 15 3542 on a single charge?

The 40 Wh rating means the pack stores 40 watt-hours of energy; actual runtime depends on your laptop's power draw, screen brightness, and workload, so it will vary from one session to the next.

Does the 14.8 V output match the original Dell MR90Y battery voltage exactly?

Yes, this replacement is rated at 14.8 V, which is the same nominal voltage as the Dell MR90Y and the listed XCMRD part numbers, so it will connect without a voltage mismatch.

Will the four-cell lithium-ion pack fit inside my Dell Latitude 3440 without modification?

The battery is built to the same form factor as the original Dell 40 Wh packs (part numbers such as 312-1387, 312-1390, 312-1392), so it slides into the Latitude 3440 bay and secures with the existing latches.

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