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Black rectangular lithium-ion battery pack with connector pins, model ZNS-31

KingSener

KingSener ZNS-31 7.4V 2500mAh laptop battery

SKU CH-FSYH-TNKQW MPN ZNS-31

7.4 V, 2500 mAh lithium-ion replacement cell built for smart door locks with a P-P+P+P+P- pin layout

  • Battery voltage rating7.4 V
  • Battery capacity2,500 mAh
  • 4V Li-ion chemistry delivers stable power for smart door locks
  • 2500mAh rated capacity provides extended runtime between charges
  • 100% compatible form factor matches original battery dimensions exactly
  • New high-quality cells and PCB ensure reliable performance
  • Conditioning cycles optimise capacity when first installed

Compatible smart-lock battery

The KingSener ZNS-31 is a 7.4V 2500mAh lithium-ion replacement cell built for specific smart door locks. It uses a P-P+P+P+P- pin layout and ships new with black casing. Buyers needing a direct swap for a depleted original pack will find the voltage and capacity match the factory design.

Check original model and pinout

Confirm the battery model printed on your existing unit reads ZNS-31 before ordering. Compare the connector orientation and the five-pin sequence against the product photos to ensure the plug aligns with the lock’s socket. The pack is sized to the original dimensions so no case modification is required.

Replaces worn or failed OEM pack

This unit restores runtime when the original cell no longer holds charge or shows swelling. The jump is worth it if the lock reports low power frequently or fails to actuate. It is not for users needing higher capacity than 2500mAh or a different voltage platform.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $18.99
Cheaper than about 74% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameKingSener
Model nameZNS-31
Part numberZNS-31
Power
Battery voltage rating7.4 V
Battery capacity2,500 mAh

Questions about this item

What comes with the KingSener ZNS-31 battery and do I need any extra parts?

The package contains the replacement battery only; no additional components or tools are required for installation.

Which capacity and voltage version of the ZNS-31 should I select?

Choose the 7.4V 2500mAh version, as this matches the original specification for the smart door lock.

How long will the 2500mAh capacity actually run my smart door lock?

Run time depends on the lock's power draw; the 2500mAh cell delivers the full rated capacity for extended operation.

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