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Rectangular lithium polymer battery pack for Microsoft Surface RT 1516

NShi

NShi Laptop Battery P21GK3 7.4V 31.5Wh 4120mAh for Microsoft Surface RT 1516

SKU CH-GTXN-493RB

Replacement lithium-polymer battery delivering 7.4V and 31.5Wh for Microsoft Surface RT 1516

  • Battery typeLithium Polymer
  • Replacement battery built for Microsoft Surface RT 1516
  • 4 V lithium polymer chemistry delivers 31.5 Wh capacity
  • 4120 mAh rating supports extended runtime per charge
  • Matches part numbers P21GK3 21CP4/106/96 exactly
  • Brand new unit backed by 12 month warranty

Replacement Battery for Surface RT 1516

This lithium-polymer battery replaces the original P21GK3 pack in the Microsoft Surface Windows RT 1516. It supplies 7.4V and 31.5Wh of capacity, matching the factory specification for the first-generation tablet. The cell is rated at 4120mAh and carries a 12-month warranty. It does not fit the second-generation Surface RT.

Thermals and Power in Daily Use

The pack delivers steady 7.4V output during typical browsing and video playback without excess heat. Internal lithium-polymer chemistry keeps self-discharge low when the tablet sits in standby. Normal charging cycles complete within the device’s standard power-management routine.

Behaviour Under Sustained Load

Continuous high-drain tasks such as extended video recording draw the 31.5Wh capacity down predictably. Voltage remains stable through the discharge curve until the tablet initiates its low-power shutdown. The replacement cell mirrors the original thermal profile under prolonged workloads.

How it compares

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

Price $55.99
Pricier than about 86% of the 27,790 comparable items (median $30.99).

Specifications

Power
Battery typeLithium Polymer

Questions about this item

How do I install the P21GK3 battery in my Surface RT 1516 and what step is often missed?

Power off the tablet, remove the old pack, connect the new 7.4V battery to the motherboard header, then secure it; the step often missed is reconnecting the cable fully before reassembly.

What maintenance or replacement will this 31.5Wh lithium-polymer pack need over time?

No scheduled maintenance is required; capacity fades with charge cycles, so plan to replace the pack when run-time no longer meets your needs.

What limit appears first during sustained use of this 4120mAh replacement battery?

The 7.4V pack will hit its thermal and voltage sag limits under continuous heavy load, reducing available capacity before the 12-month warranty period ends.

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