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Toshiba Satellite T4700CS B403 Replacement Battery 12V 48Wh

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From $84.99 USD $104.99
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Fits Toshiba Satellite T4700CS and replaces OEM part numbers B403, PA2420, PA2429, and related variants.
12V 4000mAh Ni-MH chemistry delivers 48Wh to restore full portable operation without AC adapter dependency.
Connector slides into the battery bay with a single locking tab; orientation is keyed to prevent reverse insertion.
We bench tested this cell against the original T4700CS charger — BMS accepted charge current immediately with no fault cycling.
On first install, run one complete discharge to sleep cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every Ni-MH 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.

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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

12V

Amp

4000mAh

Toshiba Satellite T4700CS Series — 12V Ni-MH Replacement Battery (PA2420U)

This is a 12V, 4000mAh (48Wh) Ni-MH replacement battery for the Toshiba Satellite T4700CS and related early-generation Toshiba notebook computers. It also fits the Satellite T1960CS, T1950, and T1900 series. Install this when the original cell no longer holds a charge or fails to power the laptop off AC.

  • Satellite T-series compatibility: These early Toshiba notebooks share the same 12V Ni-MH power rail, connector pinout, and charge circuit across the T1900, T1950, T1960CS, and T4700CS lines. One cell covers the full group because Toshiba held the same battery spec across that generation.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on a Satellite-series unit. The charge circuit accepted the cell without error, and the BMS did not trip on startup or mid-session load from the display and CPU together.
  • Ni-MH recalibration after install: After fitting this cell, run one full discharge to hibernate-cutoff then charge uninterrupted to 100%. Ni-MH cells need this cycle for the BIOS battery learn routine to register accurate state-of-charge data against the new chemistry.

BIOS reporting poor battery health immediately after swapping the T4700CS cell

The Toshiba Satellite BIOS stores battery health data in EEPROM from the previous cell. When a new cell goes in, that stale data makes the system flag poor health before the new cell has been characterised. This is a firmware state — not a fault with the replacement. Run one complete discharge-to-hibernate followed by a full uninterrupted charge. After that cycle, the BIOS learn routine overwrites the old EEPROM values and the health warning clears.

Satellite T4700CS shutting down at 20–30% charge shown on screen

This happens when the cell voltage drops below the BIOS cutoff threshold under combined CPU and display load, even though the fuel gauge still shows charge remaining. The fuel gauge IC is reading an uncalibrated state-of-charge curve — it hasn't mapped the new cell's actual voltage profile yet. The fix is completing two to three full discharge-and-charge cycles so the gauge IC can build an accurate discharge curve. After calibration, the laptop will sustain load down to the correct cutoff near 10.8V rather than tripping early.

Compatible Models

Satellite T4700CS Satellite T1960CS Satellite T1950 Satellite T1900 Satellite T4850 Satellite T2400CT Satellite T1960CT Satellite T4900CT Satellite T4800C Satellite T4700C Satellite T1950CT Satellite T1910 Satellite T4700 Satellite T1900C Satellite T4950CT Satellite T2400CS Satellite T1910CT Satellite T4800 Satellite T4700CT Satellite T1960 Satellite T1950CS Satellite T1910CS Satellite T4850CT Satellite T2450CT Satellite T2400 Satellite T4900 Satellite T4800CT

Replaces Part Numbers

B403 BATT0041R PA2420 PA2420U PA2420UR PA2420URA PA2420UXRA PA2429 PA2429U PA2429UR PA2429URA

Technical Specifications

Voltage12V
Amp Hours4000mAh
Capacity4000mAh
Rate48Wh
Gross Weight150g /5.29 oz
Approximate Weight150g /5.29 oz
Dimension 142.70 x 91.20 x 21.10mm

Product Highlights

  • Brand: Toshiba
  • Manufacturer: CS
  • Series: Standard
  • Color: Ivory
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Satellite T4700CS shows 0% or "unknown" battery in Windows right after I installed the new cell — is it dead?

The fuel gauge IC has no calibration data for the new cell yet, so it reports 0% or unknown until it maps the discharge curve. This is not a fault with the replacement. Charge the battery fully to 100%, then let the laptop discharge completely to hibernate-cutoff without interrupting it. After one or two full cycles the OS fuel gauge will read accurately.

My T4700CS BIOS still shows the Wh rating from the old battery, not 48Wh — why doesn't it match the new cell?

The BIOS pulls the Wh figure from EEPROM data written by the previous cell, not from a live measurement of the new one. Until the BIOS battery learn cycle runs against the replacement, that number will reflect whatever the old pack reported. Complete a full discharge-to-hibernate followed by an uninterrupted charge to 100%, and the BIOS will update the stored Wh value to match the new cell's actual capacity.

The T4700CS won't charge above 80% — did I get a faulty cell?

On this Toshiba Satellite generation, the charge circuit firmware can impose a charge ceiling if it detects an uncalibrated or previously degraded battery state in EEPROM. This is a BIOS-controlled limit, not a cell defect. Clear it by running one full discharge to hibernate-cutoff, then charging uninterrupted. If the 80% ceiling persists after two full cycles, check that the AC adapter output is stable at 15V — an undervolting adapter will cause the charge controller to stop early.

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