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Rectangular black lithium-polymer laptop battery, three cells, connector on one side

NShi

NShi AP18C4K laptop battery 11.4V 48Wh 4200mAh

SKU CH-1MRK-XA0AP

11.4 V, 48 Wh lithium-polymer replacement battery compatible with numerous Acer Aspire 3, Aspire 5, Swift 3, Swift S40-51 and Spin 3 models

  • Battery TypeLithium Polymer
  • Replaces AP18C4K battery in compatible Acer notebooks
  • 4 V 48 Wh 4200 mAh capacity powers extended sessions
  • Lithium polymer 3-cell design fits original chassis
  • Supports Aspire 3 5 Swift 3 Spin 3 series
  • Brand new condition ensures full rated performance

Compatible Acer laptop battery

The NShi AP18C4K is a lithium-polymer replacement battery rated at 11.4V and 48Wh with a 4200mAh capacity. It fits select Acer Aspire 3, Aspire 5, Swift 3, Swift S40-51 and Spin 3 models. Owners of those series can restore original runtime with a brand-new cell pack. Buyers who need a different voltage or connector layout cannot use this unit.

Installation and fitment checks

The pack uses the AP18C4K part number and a three-cell layout that matches the listed part numbers. Before fitting, compare the product photo with the original battery to confirm identical interface, wire length and physical dimensions. Even within the same laptop series, internal battery variants exist and a mismatch will prevent installation. No tools or firmware steps are mentioned in the supplied data.

Sustained discharge behaviour

The 48Wh rating represents the total energy available under a continuous load rather than a brief peak. Lithium-polymer chemistry delivers a steady voltage curve across the discharge cycle, so runtime scales predictably with workload. The supplier advises using the original charger and avoiding deep discharge to preserve long-term capacity. No thermal throttling data or cycle-life figure is provided.

Highlights

  • Replaces AP18C4K battery in compatible Acer notebooks
  • 4 V 48 Wh 4200 mAh capacity powers extended sessions
  • Lithium polymer 3-cell design fits original chassis
  • Supports Aspire 3 5 Swift 3 Spin 3 series
  • Brand new condition ensures full rated performance

Specifications

Battery TypeLithium Polymer

Questions about this item

How can I confirm the AP18C4K battery is working correctly after installation?

Charge the laptop with the original charger, then verify the system reports 11.4V and a capacity near 48Wh or 4200mAh in the battery settings or BIOS.

What is included with the AP18C4K battery and what must I supply?

The package contains the 3-cell lithium polymer AP18C4K battery only; you must use your existing original AC charger and laptop hardware for installation.

Which AP18C4K version should I choose for my specific Acer model?

Match the part number AP18C4K and compare the battery photo to your original; the same laptop series can use different battery sizes or connector wire lengths.

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