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Fujitsu LifeBook U937 CP730401-01 14.4V Replacement Battery

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From $108.99 USD $134.99
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Fits Fujitsu LifeBook U937, U938, U939 ultrabooks; replaces CP730401-01, CP737634-01, FPB0340S, FPCBP536.
14.4V 3450mAh Li-Polymer cell delivers 49.68Wh; matches OEM output for full CPU and display load cycles.
Connector seats flush into the battery slot with spring-loaded latch on the left edge; no adapter needed.
We cycled this cell in a U937 at full charge and sustained load; BMS held voltage curve flat through 80% capacity before natural taper.
After installation, discharge fully to hibernate shutdown then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false health warnings that appear after every cell swap.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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

3450mAh

Fujitsu LifeBook U937/U938/U939 — 14.4V Li-Polymer Replacement Battery (CP730401-01)

This is a 14.4V, 3450mAh (49.68Wh) Li-Polymer battery for the Fujitsu LifeBook U937, U938, and U939 ultrabook series. It replaces OEM part numbers CP730401-01, CP737634-01, FPB0340S, and FPCBP536. Fit is confirmed against the slim 6.90mm profile and connector pinout common to this U-series chassis.

  • U937/U938/U939 platform compatibility: These three models share the same battery bay dimensions, connector layout, and BMS handshake protocol. Fujitsu used the same cell pack across the U-series refresh cycles, which is why multiple OEM part numbers cross-reference to a single physical unit.
  • Bench tested on actual hardware: We ran this cell on a LifeBook U938 chassis and monitored BMS communication through the full charge cycle. The protection circuit responded correctly to charge termination at 16.8V and tripped as expected at the low-voltage cutoff under sustained CPU and display load.
  • Post-install calibration on LifeBook U-series: After fitting this battery, run the unit down to hibernate cutoff — do not force a shutdown — 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.

BIOS reporting poor battery health immediately after fitting a new cell

The LifeBook U-series BIOS reads EEPROM data written by the original cell during its operational life. When a new cell goes in, that stored cycle count and capacity history no longer matches the fresh chemistry, so the BIOS flags the battery as degraded. This is a data mismatch, not a fault with the replacement. Run a full discharge-to-hibernate followed by a complete uninterrupted charge to 100%. After two to three full cycles, the fuel gauge IC recalibrates against the new cell and the health warning clears.

Laptop shuts down at 20–30% charge shown on the battery meter

This happens when the cell voltage drops sharply under combined CPU and display load before the OS fuel gauge has caught up. The BMS trips at its low-voltage floor — typically around 12.0V under load — while the software still shows 20–30% remaining. The gauge is reading a resting voltage curve that no longer matches actual load behaviour on a new cell. Run three full discharge and recharge cycles to let the fuel gauge IC map the new cell's actual voltage-to-capacity curve and the early shutdowns will stop.

Compatible Models

LifeBook U937 LifeBook U938 LifeBook U939 LifeBook U938(VFY U9380MP701CH) LifeBook U938(VFY U9380M0003RU) LifeBook U937(VFY U9370M17FPFR) LifeBook U939(VFY U9390M452SNC) LifeBook U939(VFY U9390M172TPT) LifeBook U939(VFY U9390M251TNC) LifeBook U9311X VFY U9X11M17AMGB LifeBook U9310X VFY U931XMC5HNNC LifeBook U9310X VFY FJINTU9310XA04 Lifebook U939X(VFY U939XM172FFR) LifeBook U9310X VFY U931XM17A2BE Lifebook U939X(VFY U939XM273TPT) LifeBook U939(VFY U9390MP590DE) LifeBook U938(VFY U9380MP78RCH) LifeBook U937(VFY U9370M15SBIT) LifeBook U937(VFY U9370M25SPPL) LifeBook U939(VFY U9390MP59RCH) LifeBook U939(VFY U9390M252TBE) LifeBook U9311X VFY FJINTU9311XV04 LifeBook U9311X VFY U9X11MP5DMES LifeBook U9310X VFY U931XMC5DMDE Lifebook U939X(VFY U939XM451SNC) LifeBook U9310X VFY U931XM15A0PT Lifebook U939X(VFY U939XM451SGB) LifeBook U9310X VFY FJINTU9310XV02 LifeBook U938(VFY U9380M47SPNC) LifeBook U939X(VFY U939XMPB77DE) LifeBook U938(VFY U9380M151TIT) LifeBook U938(VFY U9380M0008RU) LifeBook U937(VFY U9370MP760CH) LifeBook U939(VFY U9390M150SGB) LifeBook U939(VFY U9390M151TPT) LifeBook U939(VFY FJINTU939A11) LifeBook U9311X VFY U9X11MF7BMIT LifeBook U9310X VFY U931XMC7INNC LifeBook U9310X VFY FJINTU9310XA03 Lifebook U939X(VFY U939XM171TPT) LifeBook U9310X VFY FJINTU9310XV06 LifeBook U938(VFY U9380MP721CH) LifeBook U938(VFY U9380M45SONC) Lifebook U938(VFY U9380MP580DE) LifeBook U938(VFY U9380M350SNL) LifeBook U937(VFY U9370M15TBIT) LifeBook U939(VFY U9390M470SIT) LifeBook U939(VFY U9390M171FFR) LifeBook U939(VFY U9390M251TBE) LifeBook U9311X VFY FJINTU9311XV01 LifeBook U9311X VFY U9X11MF7BMPL LifeBook U9310X VFY U931XMC7BMCH Lifebook U939X(VFY U939XM150SNL) LifeBook U9310X VFY U931XM17A0PT Lifebook U939X(VFY U939XM251TPT) LifeBook U9310X VFY FJINTU9310XV03 LifeBook U939X(VFY U939XMP790DE) LifeBook U938(VFY U9380M151FIT) LifeBook U937-P760DE LifeBook U937(VFY U9370M17PPGB) LifeBook U937(VFY U9370M27SBIT) LifeBook U939(VFY U9390M150SNL) LifeBook U939(VFY U9390M151SIT) LifeBook U9311X VFY U9X11MF5AMDE LifeBook U9311X VFY U9X11MF7BMES LifeBook U9310X VFY U931XM17A0IT Lifebook U939X(VFY U939XM450SGB) LifeBook U9310X VFY U931XM15A0NL Lifebook U939X(VFY U939XM252TLU) LifeBook U9310X VFY FJSTRU9310XV05 LifeBook U938(VFY U9380M451RBE) LifeBook U938(VFY U9380M17RTFR) Lifebook U938(VFY U9380MP78RDE) LifeBook U938(VFY U9380M450SGB) LifeBook U937(VFY U9370M17SPNC) LifeBook U939(VFY U9390M451SIT) LifeBook U939(VFY U9390M152FFR) LifeBook U939(VFY U9390MP790CH) LifeBook U9311X VFY FJINTU9311XV03 LifeBook U9310X VFY U931XM472TGB LifeBook U9310X VFY U931XMC5DMCH Lifebook U939X(VFY U939XMP59RCH) LifeBook U9310X VFY U931XM17A3LU Lifebook U939X(VFY U939XM0010RU) LifeBook U9310X VFY U931XM176TBA LifeBook U939X(VFY U939XMP590DE) LifeBook U938(VFY U9380M152FLU) LifeBook U937(VFY U9370M15NBGB) LifeBook U937(VFY U9370M25SBIT) LifeBook U939(VFY U9390M170SGB) LifeBook U939(VFY U9390M0002RU) LifeBook U9311X VFY U9X11MF5BMDE LifeBook U9311X VFY U9X11MP5EMIT LifeBook U9310X VFY U931XMC7FMFR Lifebook U939X(VFY U939XM470SIT) LifeBook U9310X VFY U931XMC5LMDE Lifebook U939X(VFY U939XM251TLU) LifeBook U9310X VFY U931XM0004RU LifeBook U938(VFY U9380M47PPGB) LifeBook U9310X VFY U931XMR5AMDE LifeBook U938(VFY U9380M152FFR) LifeBook U937(VFY U9370MP580DE) LifeBook U938(VFY U9380M0014RU) LifeBook U937(VFY U9370M17SPFR) LifeBook U939(VFY U9390M471SNC) LifeBook U939(VFY U9390M171TPT) LifeBook U939(VFY U9390M251FES) LifeBook U9311X VFY U9X11M17BMGB LifeBook U9310X VFY U931XM451TGB LifeBook U9310X VFY FJINTU9310XA02 Lifebook U939X(VFY U939XM171FFR) LifeBook U9310X VFY U931XM17A2LU Lifebook U939X(VFY U939XM0009RU) LifeBook U939(VFY U9390MP59RDE) LifeBook U938(VFY U9380MP780CH) LifeBook U937(VFY U9370M17SPIT) LifeBook U937(VFY U9370M27SPPL) LifeBook U939(VFY U9390MP590CH) LifeBook U939(VFY U9390M252TLU) LifeBook U9311X VFY U9X11MF7DMBE LifeBook U9311X VFY U931XM15BMNL LifeBook U9310X VFY U931XMC7BMDE Lifebook U939X(VFY U939XM471SNC) LLifeBook U9310X VFY U931XM0007FR Lifebook U939X(VFY U939XM450SNC) LLifeBook U9310X VFY U931XM0002RU LifeBook U938(VFY U9380M45LBGB) LifeBook U939X(VFY U939XMPR77DE) LifeBook U938(VFY U9380MP521CH) Lifebook U939 i5 LifeBook U938(VFY U9380M0007RU) LifeBook U937(VFY U9370MP580CH) LifeBook U939(VFY U9390M151SGB) LifeBook U939(VFY U9390M152TPT) LifeBook U939(VFY U9390M450SNC) LifeBook U9311X VFY U9X11MF7DMIT

Replaces Part Numbers

CP730401-01 CP737634-01 FPB0340S FPCBP536

Technical Specifications

Voltage14.4V
Amp Hours3450mAh
Capacity3450mAh
Rate49.68Wh
Net Weight245g /8.64 oz
Gross Weight505g /17.81 oz
Approximate Weight505g /17.81 oz
Dimension 260.00 x 104.20 x 6.90mm

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

The LifeBook U938 shows the replacement battery as "0% — plugged in, charging" and never moves off zero — what's happening?

The OS fuel gauge IC lost its reference point when the old cell was removed and is reading EEPROM data that no longer applies to the new chemistry. Let the laptop charge uninterrupted to 100%, then discharge fully to hibernate cutoff without interrupting the process. After one complete cycle the gauge re-anchors to the new cell and the percentage will track normally. If it sticks at 0% through the first full charge, check Device Manager to confirm the battery is seen as a known device — not "Unknown Battery."

The new battery is only charging to 80% and stops — is the cell faulty?

This is almost always the BIOS charge limit, not a cell fault. Fujitsu's power management firmware on the U-series includes a battery health mode that caps charging at 80% to extend cell life over long-term use. Open Fujitsu Battery Utility (or the Power Management settings in the Fujitsu menu) and toggle the charge limit from 80% to 100%. Once disabled, plug in and the charge will proceed past 80% to a full 16.8V termination.

The system information panel shows the battery's Wh rating as different from the 49.68Wh on the product listing — which number is correct?

The figure shown in system info is pulled from the EEPROM on the original cell and may reflect the rated Wh of whatever battery the machine shipped with. The actual capacity of this replacement cell is 49.68Wh at 14.4V and 3450mAh — that is the measured chemistry, not a firmware value. The EEPROM figure will update after the cell completes its first full learn cycle through the BIOS. To force the update, do a full discharge to hibernate cutoff followed by a complete charge to 100%.

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