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Cylindrical 18650 lithium cell, blue shrink wrap, 67.8 by 18.6 mm

Estry

Estry K63 2600mAh 3.7V standard battery

SKU CH-PTKX-KYBTK MPN K63

Rechargeable 2600 mAh 3.7 V lithium cell replaces the ICR18650 pack in Corsair K63 wireless keyboards

  • TypeRechargeable Batteries
  • Battery TypeLithium
  • Battery Capacity2600mAh
  • Battery Voltage3.7
  • Direct replacement for Corsair K63 wireless keyboard
  • 2600mAh lithium cell restores original runtime
  • Built-in protection against overcharge and short circuit
  • Certified to ISO9001, RoHS, CE and UN38.3 standards
  • Compact 67.8×18.6×18.6mm form factor fits battery bay

Compatible Replacement Battery

The Estry K63 is a direct replacement lithium-ion cell built to match the original Corsair K63 wireless keyboard battery. It delivers a 2600mAh capacity at 3.7V for reliable cordless operation. The 18650 form factor fits the keyboard's internal compartment precisely. Safety certifications include ISO9001, RoHS, CE, UN38.3 and MSDS.

Keyboard Owners Needing a Fresh Cell

This unit suits anyone whose K63 keyboard no longer holds a charge through a normal session. It restores the original runtime without soldering or adapter cables. Builders repairing other devices or users wanting higher capacity than 2600mAh should look elsewhere. The voltage and dimensions are fixed for this specific model only.

Critical Fit Specification 18650

The single detail that decides compatibility is the 18650 cell format measuring 67.8 by 18.6 by 18.6 millimetres. Your existing battery must carry the ICR18650 part number and match these exact dimensions. A different length, diameter or connector layout will prevent installation. Verify the part number before ordering.

Highlights

  • Direct replacement for Corsair K63 wireless keyboard
  • 2600mAh lithium cell restores original runtime
  • Built-in protection against overcharge and short circuit
  • Certified to ISO9001, RoHS, CE and UN38.3 standards
  • Compact 67.8×18.6×18.6mm form factor fits battery bay

Specifications

BrandCorsair
TypeRechargeable Batteries
Battery TypeLithium
Battery Capacity2600mAh
Battery Voltage3.7

Questions about this item

How often will the 18650 lithium cell need replacement under normal use?

The 2600mAh 3.7V cell is rated for hundreds of charge cycles; replacement timing depends on daily drain depth and charge habits rather than a fixed interval.

What limit appears first during continuous wireless gaming sessions?

The 9.62Wh capacity sets the runtime ceiling; sustained high polling and backlighting will deplete the pack before thermal or voltage limits are reached.

Does the pack generate noticeable heat or noise during all-day operation?

No moving parts or active cooling exist; the cell stays near ambient temperature and is silent, with protection circuitry preventing over-voltage or short-circuit heating.

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