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Rectangular black lithium-ion laptop battery with six cells and label showing MR90Y

FOCUSTEC

FOCUSTEC 65WH 11.1V 6-cell laptop battery MR90Y

SKU CH-F7M6-KW2FY

65 Wh, 11.1 V lithium-ion 6-cell replacement battery compatible with Dell Inspiron 14, 15 and 17 models including 3421, 3521, 3721, 5421, 5521 and 5721 series

  • Battery TypeLithium-Ion
  • 65 Wh capacity powers Dell Inspiron 14, 15 and 17 models through long sessions
  • 1 V six-cell lithium-ion design matches original voltage and cell count
  • Grade A cells deliver fast charging with low self-discharge
  • Built-in circuit protection guards against over-charge, over-discharge and short circuits
  • CE, FCC and RoHS certified for verified safety compliance

65WH 11.1V Dell Inspiron Battery

This 65WH lithium-ion battery uses six cells at 11.1V to replace the Dell MR90Y pack. It fits Inspiron 14, 15 and 17 models including the 3421, 3521, 3721, 5421, 5521 and 5721 series. Grade A cells and built-in circuit protection deliver stable power for daily work.

Check model number and connector

Verify the original battery part number against the compatible list such as 0MF69, 312-1390, XCMRD or MR90Y before ordering. Confirm the laptop model matches the supported Inspiron 14, 15 or 17 series shown in the specifications. Ensure the voltage reads 11.1V and the capacity is 65WH.

For owners of listed Inspiron models

Suits users replacing a worn Dell MR90Y or XCMRD battery in the listed Inspiron 14, 15 and 17 notebooks. Not for laptops outside the supported model range, buyers needing a different voltage or capacity, or devices that require a proprietary smart-battery protocol not covered by this pack.

Highlights

  • 65 Wh capacity powers Dell Inspiron 14, 15 and 17 models through long sessions
  • 1 V six-cell lithium-ion design matches original voltage and cell count
  • Grade A cells deliver fast charging with low self-discharge
  • Built-in circuit protection guards against over-charge, over-discharge and short circuits
  • CE, FCC and RoHS certified for verified safety compliance

Specifications

Battery TypeLithium-Ion

Questions about this item

Does the 65WH MR90Y battery arrive alone or with installation tools?

The package contains the 65WH 11.1V 6-cell lithium-ion battery only; no screwdrivers, pry tools or additional cables are included.

My Inspiron 15 3521 shows part number 0MF69 — is this the correct MR90Y version?

Yes, 0MF69 is listed among the compatible part numbers for the 65WH MR90Y, so this battery matches your 15 3521.

What does the 65WH rating actually deliver in a Dell Inspiron 14 3421?

The 65WH 11.1V capacity provides the same energy rating as the original XCMRD pack, giving comparable run-time for the 14 3421 under typical workloads.

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