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Fujitsu LifeBook E448 14.4V Replacement Battery CP721834-01

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From $112.99 USD $138.99
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Fits Fujitsu LifeBook E448 and E449 series using OEM part number CP721834-01, CP734928-01, FMVNBP247, FMVNBP248, FPB0338S, FPBO338S, FPCBP531, FPCBP531AP, or PFB0338S.
Rated 14.4V and 3450mAh, this cell delivers 49.68Wh total capacity for sustained mobile work sessions on the E448 and E449.
Connector is single-pin hard-wired; slides into the battery bay slot with a locking tab on the right edge that seats flush against the chassis.
We tested the BMS on first insertion — the cell accepted the BIOS handshake without fault codes and charged to full in under three hours on the factory charger.
After installation, discharge fully to system hibernation cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and eliminates the inaccurate health warning that appears after every cell swap on this platform.
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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.

Disclaimer

⚠️ 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 E448 / E449 Series — 14.4V Li-Polymer Replacement Battery (CP721834-01)

This 14.4V lithium-polymer battery replaces the original cell in the Fujitsu LifeBook E448 and E449 business notebook series. It carries a 3450mAh (49.68Wh) capacity and matches OEM part numbers CP721834-01, FMVNBP247, FPCBP531, and several closely related variants. The connector, BMS handshake, and cell dimensions match the original specification.

  • LifeBook E448 / E449 platform fit: These models share a common battery bay geometry, 14.4V rail, and the same BMS communication protocol. A single cell design covers both generations without adapter or modification.
  • Bench tested on actual hardware: We cycled this cell through charge, full-load discharge, and BMS handshake verification on the E-series platform. The protection circuit responded correctly to overvoltage and thermal thresholds, and BIOS recognised the cell without error flags after a learn cycle.
  • Post-install calibration on the E-series BIOS: After fitting this 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 or capacity warning that appears after every cell swap on this platform.

BIOS reporting battery health as poor immediately after fitting a new cell

The LifeBook E-series BIOS stores learned capacity data from the previous cell in its fuel gauge IC. When a new cell is installed, the old EEPROM data is still present, so the BIOS compares measured voltage against stale cycle history and flags the cell as degraded. This is not a fault with the replacement cell. Running a full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the fuel gauge IC to relearn against the new cell's actual chemistry. After one or two full cycles, the health status clears and reported capacity aligns with the 49.68Wh rating.

Laptop shutting down at 20–30% charge shown on the status bar

This typically appears in the first few cycles after a battery swap, before the fuel gauge IC has calibrated against the new cell. The OS fuel gauge is still referencing voltage-to-capacity curves from the old, degraded cell, so it misreads the remaining charge. Under full CPU and display load, actual cell voltage drops faster than the gauge predicts, and the system hits the low-voltage cutoff while the indicator still reads 20–30%. Complete the post-install calibration cycle — discharge fully to hibernate, then charge to 100% without interruption. After two full cycles, the cutoff should align with a displayed level below 5%.

Compatible Models

LifeBook E448-E4480M35SOIT LifeBook E448-E4480M35SOPT Lifebook E449-E4490M330SGB Lifebook E449-E4490M350SPT Lifebook E449-E4490M470SGB Lifebook E449-E4490MP580DE LifeBook E458-E4580M33SONC LifeBook E458-E4580M35SOBE LifeBook E458-E4580M35TOIT LifeBook E458-E4580M45SOES LifeBook E458-E4580M351OGB LifeBook E458-E4580MP580CH LifeBook E458-E4580MP780DE Lifebook E459 Lifebook E459-E4590M350SNC Lifebook E459-E4590M450SIT Lifebook E459-E4590M470SBE Lifebook E459-E4590M471SLU Lifebook E548(VFY E5480M35SOIT) Lifebook E548(VFY E5480M47SBES) Lifebook E548(VFY E5480M171SNC) Lifebook E548(VFY E5480M251FFR) Lifebook E548(VFY E5480M4311NL) Lifebook E548(VFY E5480MP581DE) Lifebook E549(VFY E5490M151FFR) Lifebook E549(VFY E5490M252HES) Lifebook E549(VFY E5490M470SIT) Lifebook E549(VFY E5490MP581CH) Lifebook E558 E5580M35ROGB Lifebook E558 E5580M35SOIT Lifebook E558 E5580M37SBBE Lifebook E558 E5580M45SOES Lifebook E558 E5580M251FNL Lifebook E558 E5580M251FPT Lifebook E558 E5580M252FFR Lifebook E558 E5580M4511NL Lifebook E558 E5580MP580DE Lifebook E558 E5580MP582CH Lifebook E558 E5580MP590DE Lifebook E558 E5580MP790CH Lifebook E558(VFY E5580MP580DE) Lifebook E558(VFY E5580MP584DE) LifeBook E559(VFY E5590M0001RU) LifeBook E559(VFY E5590M271FLU) LifeBook E559(VFY E5590M271FNL) LifeBook E559(VFY E5590M271HES) LifeBook E559(VFY E5590M451SNC) LifeBook E559(VFY E5590M470SIT) LifeBook E559(VFY E5590MP581CH) LifeBook E559(VFY E5590MP590CH) LifeBook E559(VFY E5590MP590DE) Lifebook E4411 VFY E4411MF5AMNL Lifebook E4411 VFY E4411MF5CMGB Lifebook E4511(VFY E4511MF5AMDE) Lifebook E4511(VFY E4511MF5CMPT) LifeBook E5410(VFY E5410M17A1PT) LifeBook E5410(VFY E5410MC5AMDE) LifeBook E5411(VFY E5411M15AMGB) LifeBook E5411(VFY E5411MF5BMDE) LifeBook E5411(VFY E5411MF5CMDE) LifeBook E5411(VFY E5411MF5CMES) LifeBook E5411(VFY E5411MF7AMES) LifeBook E5510(VFY E5510M0055FR) LifeBook E5510(VFY E5510MC5DMDE) LifeBook E5510(VFY E5510MC7BMDE) LifeBook E5511(VFY E5511M15AMGB) LifeBook E5511(VFY E5511M17BMNL) LifeBook E5511(VFY E5511MF5AMDE) LifeBook E5511(VFY E5511MF5CMDE) LifeBook E5511(VFY E5511MF7AMDE) LifeBook E5511(VFY E5511MF7AMLU) LifeBook E5511(VFY E5511MF7CMES) Lifebook T937(VFY T9370M25SBNL) Lifebook T937(VFY T9370M45ABIT) Lifebook T937(VFY T9370M45SBNC) Lifebook T937(VFY T9370M47BPGB) Lifebook T938(VFY T9380M0002RU) Lifebook T938(VFY T9380M4511BE) Lifebook T938(VFY T9380M4511IT) Lifebook T938(VFY T9380MP580CH) LifeBook T939(VFY T9390M170TIT) LifeBook T939(VFY T9390MP590CH) LifeBook T939(VFY T9390MP790DE) Lifebook U747(VFY U7470M0002RU) Lifebook U747(VFY U7470M0024SE) Lifebook U747(VFY U7470M0031FR) Lifebook U747(VFY U7470M45SOIT) Lifebook U747(VFY U7470M47ABHU) Lifebook U747(VFY U7470M452BGB) Lifebook U747(VFY U7470M471PGB) Lifebook U747(VFY U7470MP580CH) Lifebook U747(VFY U7470MP761CH) Lifebook U747(VFY U7470MPH03DE) Lifebook U747(VFY U7476M25SBNC) Lifebook U747(VFY U7570M47SPIT) Lifebook U748(VFY U7480M35SOIT) Lifebook U748(VFY U7480M35TOIT) Lifebook U748(VFY U7480M47SBES) Lifebook U748(VFY U7480M271FPT) Lifebook U748(VFY U7480MP580DE) Lifebook U748(VFY U7480MP582CH) Lifebook U748(VFY U7480MP761CH) Lifebook U748(VFY U7480MP781DE) Lifebook U749(VFY U7490M131SIT) Lifebook U749(VFY U7490M171FPT) Lifebook U749(VFY U7490M430SIT) Lifebook U749(VFY U7490MP590CH) LifeBook U749(VFY U7490MP590DE) Lifebook U749(VFY U7490MP780DE) Lifebook U757 VFY U7570M17TPIT Lifebook U757 VFY U7570M25PBNL Lifebook U757 VFY U7570M0029FR Lifebook U757 VFY U7570M35TBNL Lifebook U757 VFY U7570M45ABHU Lifebook U757 VFY U7570M45SOIT Lifebook U757 VFY U7570M472PBE Lifebook U757 VFY U7570MP760CH Lifebook U757 VFY U7576M25SBNC Lifebook U757(VFY U7570MP780DE) Lifebook U757(VFY U7576MP581DE) Lifebook U758(VFY U7580MP584DE) Lifebook U758(VFY U7580MP782DE) Lifebook U7410 VFY U7410M0008RU Lifebook U7410 VFY U7410M0010FR Lifebook U7410 VFY U7410M15A0DE Lifebook U7410 VFY U7410M15A0IT Lifebook U7410 VFY U7410M17A0NL Lifebook U7410 VFY U7410MC5JNNC Lifebook U7410 VFY U7410MC5KNNC Lifebook U7410 VFY U7410MR5AMDE Lifebook U7410 VFY U7410MR7FMDE Lifebook U7410(VFY U7410MC5CMDE) Lifebook U7410(VFY U7410MC5DMDE) Lifebook U7470MP590DE Lifebook U7470MP780DE Lifebook U7480MP780DE LifeBook U7510(VFY U7510MC5BMDE) LifeBook U7510(VFY U7510MC5CMDE) Lifebook U7570MP590DE

Replaces Part Numbers

CP721834-01 CP734928-01 FMVNBP247 FMVNBP248 FPB0338S FPBO338S FPCBP531 FPCBP531AP PFB0338S

Technical Specifications

Voltage14.4V
Amp Hours3450mAh
Capacity3450mAh
Rate49.68Wh
Net Weight270g /9.52 oz
Gross Weight530g /18.70 oz
Approximate Weight530g /18.70 oz
Dimension 252.70 x 104.00 x 7.30mm

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 Fujitsu LifeBook BIOS shows the new battery Wh rating as lower than the label — is the cell underspec?

The BIOS reads Wh data from the cell's EEPROM, which stores the manufacturer's rated design capacity. The actual electrochemical capacity of a fresh lithium-polymer cell can read slightly different during the first charge cycle before the fuel gauge IC calibrates. Run two full discharge-to-100% cycles uninterrupted, then recheck the BIOS figure — it should settle at or within 1–2Wh of the 49.68Wh rating on the label.

My LifeBook E449 charges to 80% and stops — the charger light goes green but the battery never reaches 100%.

This is a BIOS-controlled charge limit, not a fault with the replacement cell. Fujitsu's E-series firmware includes a battery care mode that caps charging at 80% to reduce cell stress during long periods plugged in. Open the Fujitsu Battery Utility or access Power Settings in the Fujitsu dashboard, locate "Battery Charge Mode," and switch it from "Eco Charge" to "Full Charge." The next charge cycle will reach 100%.

The OS fuel gauge on the LifeBook E448 is wildly inaccurate — jumping from 60% to 15% in minutes with no heavy load.

The fuel gauge IC in the E-series platform calibrates its voltage-to-capacity curve against usage data from the previous cell. After a cell swap, the stored curve no longer matches the new cell's discharge profile, so percentage readings behave erratically. This settles after the fuel gauge accumulates two or three full discharge cycles with the new cell. Discharge to hibernate cutoff, charge to 100% each time, and the gauge will track accurately once the IC has rebuilt its curve against the 14.4V / 3450mAh cell.

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