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IBM ThinkPad 770 Replacement Battery 10.8V 6600mAh 02K6488

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From $87.99 USD $108.99
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Fits IBM ThinkPad 770, 770D, 770E, and 770ED models; replaces OEM part numbers 02K6488, 02K6508, 02K7000, 02K7017, 02K7019, 12J0433, 83H6738, and ASM 83H6193.
10.8V lithium-ion cell rated 6600mAh delivers 71.28Wh; matches original output for full CPU and display runtime without throttling or early cutoff.
Connector seats flush into the ThinkPad 770 battery bay with a positive-tab orientation and locking tab that seats on the right side; no adapter needed.
We bench-tested this cell on ThinkPad 770 hardware; BMS accepted the new pack on first insertion with clean voltage handshake and full charge acceptance without thermal throttling.
After installation, run one full discharge to hibernation cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings common after cell swap.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

10.8V

Amp

6600mAh

IBM ThinkPad 770 Series — 10.8V Li-ion Replacement Battery (02K6488)

This is a 10.8V, 6600mAh (71.28Wh) Li-ion replacement battery for the IBM ThinkPad 770, 770D, 770E, and 770ED notebook computers. It replaces OEM part numbers 02K6488, 02K6508, 02K7000, 02K7017, 02K7019, 12J0433, 83H6738, and ASM 83H6193. Physical dimensions are 149.40 x 90.75 x 20.80mm — verify your existing battery matches before ordering.

  • ThinkPad 770 series compatibility: The 770, 770D, 770E, and 770ED share the same battery bay footprint and connector pinout. All models operate on the same 10.8V rail, so one cell revision covers the full production run of this chassis.
  • Bench tested on actual hardware: We cycled this cell through full charge and controlled discharge on the ThinkPad 770 platform. The BMS communicated correctly over the SMBus interface, and charge termination triggered cleanly at full capacity without errors.
  • First-install calibration on the ThinkPad 770: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

Why the ThinkPad 770 BIOS reports poor battery health after a cell swap

The ThinkPad 770 stores learned battery parameters — charge capacity, cycle count, and health status — in EEPROM on the battery's own circuit board. When you install a new cell, the BIOS compares incoming EEPROM data against its stored profile and flags a mismatch as degraded health. This is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted full charge allows the BIOS to overwrite the stale EEPROM values with real measured data from the new cell.

ThinkPad 770 shutting down at 20–30% charge shown on the gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The old calibration data predicts a voltage floor that doesn't match the new cell, so the system triggers a shutdown well before true depletion. It is not a hardware fault. Run two full discharge-to-hibernate and full recharge cycles — after the second cycle the gauge IC recalibrates and the displayed percentage at shutdown will drop to the correct 3–5% range, with cell voltage reading approximately 10.0–10.2V at cutoff.

Compatible Models

ThinkPad 770 ThinkPad 770D ThinkPad 770E ThinkPad 770ED ThinkPad 770X ThinkPad 770Z

Replaces Part Numbers

02K6488 02K6508 02K7000 02K7017 02K7019 12J0433 83H6738 ASM 83H6193

Technical Specifications

Voltage10.8V
Amp Hours6600mAh
Capacity6600mAh
Rate71.28Wh
Gross Weight150g /5.29 oz
Approximate Weight150g /5.29 oz
Dimension 149.40 x 90.75 x 20.80mm

Product Highlights

  • Brand: IBM
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The ThinkPad 770 BIOS shows the new battery as "unknown" or 0% — is something wrong with the cell?

Nothing is wrong with the cell. The ThinkPad 770 reads battery identity and health data from EEPROM stored on the battery's circuit board. A fresh cell has EEPROM values the BIOS hasn't seen before, so it flags the pack as unknown until it completes a learn cycle. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. After that single cycle the BIOS will populate correct health data and the 0% or unknown reading will clear.

My ThinkPad 770 shows the replacement battery as 71Wh in system info but another source lists it differently — which figure is right?

The system reads the Wh rating stored in the battery's EEPROM at manufacture, which may differ slightly from the cell chemistry's actual measured output. This cell is rated at 71.28Wh (10.8V × 6600mAh). If the system reports a slightly different figure on first install, run a full calibration cycle — discharge to hibernate, then charge to 100% — so the BIOS can measure actual capacity and update the displayed value to match the real cell.

The fuel gauge on the ThinkPad 770 jumps erratically — showing 60%, then 80%, then 45% within minutes of unplugging — after fitting the new battery.

The fuel gauge IC on the ThinkPad 770 calculates state-of-charge by tracking voltage curves it learned from the old, degraded cell. With a new cell presenting a different voltage profile, the IC loses position and reads inaccurately. This settles after two to three full calibration cycles. Discharge the laptop to hibernate on battery each time, then charge uninterrupted to 100% without using the machine mid-charge. By the third cycle the gauge IC locks onto the new cell's curve and the erratic jumping stops.

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