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Panasonic Toughbook CF-C2 MK1 Compatible Battery 10.8V 6400mAh

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From $111.99 USD $137.99
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Fits Panasonic Toughbook CF-C2 MK1 and CF-C2 models; replaces CF-VZSU80U, CF-VZSU82U, CF-VZSU83U.
10.8V lithium-ion cell with 6400mAh capacity delivers 69.12Wh total energy for full workday portable operation.
Connector slides straight into the battery bay with a single locking tab; orientation is keyed to prevent reverse insertion.
We bench-tested this cell against the CF-C2 MK1 dock charger; the BMS accepted the charge handshake within two cycles with no fault codes.
After installation, discharge fully to system hibernation cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears phantom low-health warnings.
Extended delivery time

Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.

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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

6400mAh

Panasonic Toughbook CF-C2 MK1 — 10.8V Li-ion Replacement Battery (CF-VZSU80U)

This 10.8V 6400mAh (69.12Wh) lithium-ion battery replaces the original cell in the Panasonic Toughbook CF-C2 MK1 and CF-C2. It fits using OEM part numbers CF-VZSU80U, CF-VZSU82U, and CF-VZSU83U. Install this when the original battery no longer holds a usable charge during field use.

  • CF-C2 MK1 and CF-C2 fit: Both the MK1 and base CF-C2 share the same 10.8V three-cell battery rail, connector pinout, and BMS handshake protocol. All three OEM part numbers are electrically identical — Panasonic revised the part number across minor board revisions without changing the cell specification.
  • Bench tested on actual hardware: We ran this cell on a CF-C2 MK1 unit under combined CPU and display load. The BMS held the charge curve cleanly through a full cycle and the protection circuit tripped correctly at low-cell cutoff with no false shutdowns during discharge.
  • First-cycle conditioning on the CF-C2: After fitting the new cell, 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 the CF-C2 BIOS flags after every cell swap.

CF-C2 BIOS reporting poor battery health immediately after replacement

The CF-C2 BIOS reads health data from the battery's EEPROM, which stores cycle count and rated capacity from the previous cell. A new replacement cell ships with default EEPROM values that do not match the BIOS's learned baseline from the old battery. This triggers a "battery deterioration" or "poor health" warning on first boot — it is not a fault in the replacement cell. Run one full discharge-to-hibernate then a full uninterrupted charge to 100%. The BIOS learn cycle rewrites the baseline against the new cell and the warning clears.

Toughbook CF-C2 shutting down abruptly at 20–30% charge shown

This is a voltage cliff failure, not a fuel gauge error. When the cell cannot sustain voltage under combined CPU plus display load, the BMS cuts power before the OS-reported percentage reaches zero. The fuel gauge IC in the CF-C2 calculates remaining capacity against an older cell profile, so the percentage shown at cutoff looks higher than expected. Run two to three full calibration cycles — full discharge to hibernate, full charge to 100% — so the fuel gauge IC can recalibrate its model against the new cell's actual voltage curve.

Compatible Models

Toughbook CF-C2 MK1 Toughbook CF-C2

Replaces Part Numbers

CF-VZSU80U CF-VZSU82U CF-VZSU83U

Technical Specifications

Voltage10.8V
Amp Hours6400mAh
Capacity6400mAh
Rate69.12Wh
Net Weight343.6g /12.12 oz
Gross Weight493.6g /17.41 oz
Approximate Weight493.6g /17.41 oz
Dimension 192.80 x 71.00 x 22.10mm

Product Highlights

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

Frequently Asked Questions

The CF-C2 is showing the wrong Wh rating in the battery info panel after I installed the new cell — is something wrong with it?

Nothing is wrong. The Wh figure shown in the system panel is pulled from the battery EEPROM, which stores the rated value from the previous cell's chemistry profile. The new cell ships with its own EEPROM data — 69.12Wh — which may differ from what the old cell reported. Run the BIOS battery learn cycle: discharge fully to hibernate cutoff, then charge uninterrupted to 100%. The system will update its stored Wh baseline against the new cell.

The fuel gauge on my CF-C2 is jumping around wildly — it shows 60%, then 80%, then drops to 40% within a few minutes. What's happening?

The fuel gauge IC in the CF-C2 builds its capacity model from historical discharge data tied to the old cell. After a cell swap, it has no valid baseline for the new cell's voltage curve, so percentage readings are unstable for the first few cycles. This is not a fault in the replacement battery. Run three full discharge-to-hibernate and full charge-to-100% cycles and the fuel gauge IC will recalibrate its model — readings stabilise after that.

My CF-C2 charged to 80% and stopped — the charging indicator light went off and it won't go higher. Is the new battery defective?

This is almost always the CF-C2 BIOS charge limit firmware, not a fault in the cell. Panasonic's power management BIOS includes a charge threshold setting that caps charging at 80% to reduce cell stress during AC-tethered use. Check the Panasonic Power Plan Extension utility — it will show a "Battery Charge Mode" or similar toggle. Switch it from "Long Life" or "80%" mode to "Normal Charge" and the battery will charge to 100% on the next cycle.

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