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Fujitsu LifeBook Q702 14.4V Replacement Battery CP588146-01

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From $73.99 USD $91.99
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Fits Fujitsu LifeBook Q702 and Stylistic Q702 ultraportables; replaces CP588146-01, FBP0287, FMVNBP221, FPCBP374.
14.4V, 3050mAh Li-Polymer delivers 43.92Wh — matches factory capacity for full charge cycles on this ultrabook.
Connector slides straight into the slot with locking tab; orientation keyed to prevent reverse insertion on the Q702 chassis.
We ran a full discharge-to-hibernate cycle then uninterrupted charge to 100%; BMS engaged normally with no cutoff faults or voltage irregularities.
After install, run one complete discharge to sleep mode then charge uninterrupted to full — this resets the BIOS battery learn cycle and clears false health warnings.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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

14.4V

Amp

3050mAh

Fujitsu LifeBook Q702 / Stylistic Q702 — 14.4V Li-Polymer Replacement Battery (CP588146-01)

This 14.4V, 3050mAh (43.92Wh) Li-Polymer battery is a direct replacement for the Fujitsu LifeBook Q702 and Stylistic Q702. It targets degraded or dead cells that leave the ultraportable stranded on AC power. OEM part numbers CP588146-01, FBP0287, FMVNBP221, and FPCBP374 all cross to this unit.

  • LifeBook Q702 and Stylistic Q702 compatibility: Both platforms share the same 14.4V battery rail, connector pinout, and BMS handshake protocol. A single cell swap covers either device without adapter changes or firmware workarounds.
  • Bench tested on actual hardware: We ran charge and discharge cycles on the Q702 platform. The BMS negotiated correctly with the host, charge acceptance held steady across cycles, and the protection circuit tripped cleanly at low-voltage cutoff without requiring a manual reset.
  • Post-install calibration on the Q702: After fitting this battery, run one full discharge until the system hibernates, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false "poor health" warning that appears after every cell swap on the Q702.

BIOS reporting poor battery health immediately after fitting a new cell

The Q702 BIOS reads health data stored in the outgoing cell's EEPROM. When a new cell arrives, that EEPROM data is either blank or mismatched, so the BIOS flags the battery as degraded before it has run a single cycle. This is not a fault with the replacement cell. Run one full discharge-to-hibernate followed by a full uninterrupted charge to 100%. The BIOS learn cycle writes fresh data to the new cell and the health warning clears.

Q702 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 gauge under-reports remaining charge, and the system hits its shutdown threshold while the cell still holds usable capacity. It is not a dead cell. Complete two to three full discharge and charge cycles without interruption. After calibration, the displayed percentage aligns with the cell's real state of charge and early shutdowns stop.

Compatible Models

LifeBook Q702 Stylistic Q702

Replaces Part Numbers

CP588146-01 FBP0287 FMVNBP221 FPCBP374

Technical Specifications

Voltage14.4V
Amp Hours3050mAh
Capacity3050mAh
Rate43.92Wh
Net Weight295.2g /10.41 oz
Gross Weight435.2g /15.35 oz
Approximate Weight435.2g /15.35 oz
Dimension 235.50 x 100.42 x 7.75mm

Product Highlights

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

Frequently Asked Questions

My Fujitsu Q702 shows the new battery as "0% available (plugged in, not charging)" — what's wrong?

The BIOS did not complete a handshake with the new cell's EEPROM on first boot. Power off completely, remove the battery, refit it firmly, then boot directly into BIOS to let the system re-detect the pack. Once the BIOS acknowledges the cell, shut down, plug in the charger, and allow a full uninterrupted charge to 100% before using the laptop on battery.

The Fujitsu Q702 fuel gauge jumps wildly — showing 80%, then 45%, then 90% within minutes of unplugging.

The fuel gauge IC is still mapping its charge curve against the new cell's chemistry. The old calibration data does not match the new cell, so estimates swing until the IC learns the voltage-to-capacity relationship. Run two full discharge cycles to hibernate cutoff, each followed by a full charge to 100% without interruption. The gauge stabilises after those two complete cycles.

System info on my Q702 shows the wrong Wh rating for this replacement battery — is the cell undersized?

The Wh figure shown in system properties pulls from the EEPROM on the installed cell, not from a live measurement. A freshly fitted cell often reports the rated value from its firmware rather than a measured value, and that figure updates only after the BIOS completes at least one full learn cycle. Run one full discharge to hibernate followed by a full charge to 100%. After the learn cycle completes, the system will report 43.92Wh — the correct rated capacity for this pack.

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