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Rectangular black lithium-ion laptop battery with six cells and label showing model 3521

FOCUSTEC

FOCUSTEC 3521 laptop battery 5200mAh 11.1V 6-cell

SKU CH-63VW-WEXPR MPN 3521

Replacement lithium-ion battery delivers 5200mAh at 11.1V across six cells for Dell Inspiron 1525 and 1526 series laptops

  • Battery TypeLithium-Ion
  • 5200 mAh capacity extends runtime between charges
  • 1 V 6-cell lithium-ion design matches original specifications
  • CE FCC RoHS certified for safe operation
  • Fits Dell Inspiron 1525 1526 1545 1546 1750 1440 series
  • Replaces GW240 RN873 M911G K450N and other listed part numbers

Replacement laptop battery

This lithium-ion battery replaces original Dell Inspiron 1525 and 1526 series packs. It delivers 5200mAh capacity at 11.1V across six cells. The unit carries CE, FCC and RoHS safety certifications. Model number is 3521.

Compatibility checklist

It suits owners of Dell Inspiron 1525, 1526, 1545, 1546, 1750 or 1440 laptops needing a direct-fit replacement. Buyers whose part numbers are not in the listed compatibility table should verify fitment before ordering. The battery does not support models outside the specified Dell series.

Capacity and voltage

The decisive specification is 5200mAh at 11.1V in a six-cell lithium-ion format. This combination determines runtime and electrical match for the target Dell systems. Confirm your original battery shows the same voltage and cell count before purchase.

Highlights

  • 5200 mAh capacity extends runtime between charges
  • 1 V 6-cell lithium-ion design matches original specifications
  • CE FCC RoHS certified for safe operation
  • Fits Dell Inspiron 1525 1526 1545 1546 1750 1440 series
  • Replaces GW240 RN873 M911G K450N and other listed part numbers

Specifications

Battery TypeLithium-Ion

Questions about this item

How long will the 5200mAh capacity actually run my Dell Inspiron 1525?

Runtime depends on your laptop's power draw, screen brightness and workload; a 5200mAh 11.1V pack typically delivers several hours of mixed use on these models.

What connection does the battery use and will it charge at full speed?

It uses the original Dell proprietary connector for the Inspiron 1525/1526 series, so charging rate matches the factory specification.

Will the 6-cell pack fit flush in my Inspiron 1545 without a bulge?

The 6-cell design matches the standard battery bay on Inspiron 1525, 1526, 1545, 1546 and 1750 models, sitting flush with the chassis.

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