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Black rectangular lithium-ion laptop battery with label showing model PA5278U-1BRS 48WH 11.4V

KingSener

KingSener PA5278U-1BRS 48WH 11.4V laptop battery

SKU CH-RB7T-JF484 MPN PA5278U-1BRS

Replacement lithium-ion battery delivering 48 Wh at 11.4 V for select Toshiba Portégé X30 and Tecra X40 series laptops

  • Battery TypeLithium-Ion
  • Battery Voltage11.4V
  • Battery Capacity48WH/4080mAh
  • 48WH capacity supports longer unplugged sessions
  • 4V lithium-ion chemistry matches original specifications
  • Replaces PA5278U-1BRS and PA5278U part numbers directly
  • Compatible with Portégé X30 and Tecra X40 series laptops
  • 4080mAh rating delivers reliable daily power

Compatible replacement for Toshiba Portégé and Tecra

This KingSener PA5278U-1BRS lithium-ion battery replaces the original PA5278U-1BRS and PA5278U packs. It fits Toshiba Portégé X30-D, X30-E and X30-F series as well as Tecra X40-D, X40-E and X40-F series laptops. The unit is new and rated at 48WH with a voltage of 11.4V.

Verify the exact model

Check the part number printed on your existing battery against PA5278U-1BRS and PA5278U. Confirm your laptop appears in the supported lists such as Portégé X30-D-123, X30-E-11D, X30-D-10M or Tecra X40-D-11F, X40-D-145 and X40-E-108. Ensure the connector layout matches the original unit.

Rated 48WH at 11.4V for standard mobile workloads

The 4080mAh lithium-ion cells deliver the specified capacity for typical office and travel use. Normal operation stays within the designed thermal envelope for these ultraportable chassis. Power draw follows the laptop's built-in management without extra noise or heat beyond the original specification.

Highlights

  • 48WH capacity supports longer unplugged sessions
  • 4V lithium-ion chemistry matches original specifications
  • Replaces PA5278U-1BRS and PA5278U part numbers directly
  • Compatible with Portégé X30 and Tecra X40 series laptops
  • 4080mAh rating delivers reliable daily power

Specifications

Battery TypeLithium-Ion
Battery Voltage11.4V
Battery Capacity48WH/4080mAh

Questions about this item

What comes inside the KingSener PA5278U-1BRS box and do I need any extra parts?

The package contains the 11.4V 48WH lithium-ion battery only; no tools, screws or cables are included so nothing else must be bought separately.

Should I choose the 48WH version or a different capacity for my Toshiba Portégé X30-D-123?

This model is offered in a single 48WH / 4080mAh capacity, so there is no alternative capacity to select for the listed Portégé and Tecra X40 series.

How does the 48WH rating translate to actual runtime once the battery is installed in a Tecra X40-E-108?

The 48WH capacity at 11.4V provides the same energy budget as the original PA5278U pack, delivering comparable run time for typical office workloads on the X40-E chassis.

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