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Black rectangular laptop battery with smooth finish

Beisite

Beisite 21CP3/82/138 7.7V 39Wh Black Battery

SKU CH-F8QR-7Z1CD

A 7.7 V lithium-ion laptop battery delivering 39 Wh of capacity in a black housing

  • ColorBlack
  • TypeBattery
  • Battery TypeLithium-Ion
  • Battery Voltage7.7V
  • Battery Capacity39Wh
  • Lithium-ion chemistry provides stable 7.7 V output
  • 39 Wh capacity supports extended mobile sessions
  • Black finish matches original laptop aesthetics
  • Part number 21CP3/82/138 ensures exact replacement fit
  • New condition guarantees full rated cycle life

Replacement Battery for Compatible Laptops

This 7.7V 39Wh lithium-ion battery replaces worn original cells in supported laptops. It restores mobile runtime for users who work away from mains power. The black housing matches standard chassis colours. Buyers needing a higher-capacity pack or a different voltage should verify their service manual before ordering.

Upgrade From Degraded Original Cells

The pack replaces an aged battery that no longer holds a useful charge. Swapping it restores full discharge cycles and removes sudden shutdowns. The jump is worth it when the original falls below half its rated runtime. Systems requiring a different form factor or connector cannot use this unit.

Straightforward Swap With Basic Tools

Installation involves opening the bottom case, disconnecting the old pack and fitting this one in its place. Most designs use a single multi-pin connector that keys one way. Common issues are reversed polarity forcing, stripped case screws or forgetting to reconnect the battery ribbon before reassembly.

Highlights

  • Lithium-ion chemistry provides stable 7.7 V output
  • 39 Wh capacity supports extended mobile sessions
  • Black finish matches original laptop aesthetics
  • Part number 21CP3/82/138 ensures exact replacement fit
  • New condition guarantees full rated cycle life

Specifications

Part Number21CP3/82/138
ColorBlack
TypeBattery
Battery TypeLithium-Ion
Battery Voltage7.7V
Battery Capacity39Wh

Questions about this item

What laptop models does the Beisite 21CP3/82/138 battery fit?

This battery carries part number 21CP3/82/138 and is built to replace the original pack in compatible laptops; verify your device manual lists this exact part number before purchase.

How do I install the battery, and what step is often missed?

Power off the laptop, disconnect the AC adapter, remove the old pack, connect the new battery cable firmly to the motherboard header, then secure the pack with its original screws.

When will the 39 Wh lithium-ion pack need replacement?

Capacity fades with each full charge cycle; expect reduced runtime after several hundred cycles, so plan a replacement when run time no longer meets your needs.

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