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Black rectangular laptop battery with six cells visible on the side

FOCUSTEC

FOCUSTEC laptop battery 6 cells 4400mAh 11.1V Black

SKU CH-D5A3-DH28B

A 6-cell lithium-ion replacement battery rated at 4400mAh and 11.1V with short-circuit, overheat and overload protection

  • Battery TypeLithium-Ion
  • Restores laptop runtime with 4400 mAh 11.1 V lithium-ion cell pack
  • Tested to match OEM specifications for reliable charging performance
  • Built-in short-circuit overheat and overload protection for safe operation
  • Grade A cells rated for up to 500 charge cycles
  • Fits Samsung NP300 NP305 NP355 RV510 RV511 RV515 Q430 RC512 R530 R540 models

Compatible Samsung Models

This replacement battery fits a wide range of Samsung laptops including the NP300, NP305, NP355, RV510, RV511, RV515, RV520, RV540, RV720, R530, R540, RC512, Q430, and 300E4X series. It restores mobility to machines that can no longer hold a charge with their original packs.

49 Wh Lithium-Ion Limits

The 6-cell lithium-ion pack delivers 4400 mAh at 11.1 V for a rated 49 Wh capacity. Single-charge runtime depends entirely on the laptop's power draw, screen brightness, and workload, so actual battery life will vary from the rated figure.

Upgrading From Degraded Originals

The battery replaces worn-out OEM packs that have dropped below usable capacity after hundreds of cycles. It is not suited for users who need extended runtime beyond the original 49 Wh specification or for laptops outside the listed compatibility list.

Highlights

  • Restores laptop runtime with 4400 mAh 11.1 V lithium-ion cell pack
  • Tested to match OEM specifications for reliable charging performance
  • Built-in short-circuit overheat and overload protection for safe operation
  • Grade A cells rated for up to 500 charge cycles
  • Fits Samsung NP300 NP305 NP355 RV510 RV511 RV515 Q430 RC512 R530 R540 models

Specifications

Battery TypeLithium-Ion

Questions about this item

Is the 4400mAh 11.1V version the only capacity offered for these Samsung models?

The listing shows a single 6-cell pack rated at 4400mAh and 11.1V, delivering 49Wh. No other capacities or cell counts appear for the compatible NP-RV520, NP-RV540, NP-RV720 or 300E4X series.

What runtime can I expect from the 49Wh rating in a Samsung NP-RV540?

The 49Wh pack supplies 4400mAh at 11.1V. Actual runtime depends on the NP-RV540's power draw, screen brightness and workload, but the watt-hour figure is the standard measure for comparing capacity across batteries.

Does this battery use a proprietary Samsung connector or a standard laptop interface?

It is built as a direct replacement for Samsung packs such as AA-PB9NC6B and AA-PB9NS6B, so it mates with the existing battery bay and charging circuitry of models like the NP300E5A, R540 and RV510 without adapters.

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