Toshiba Dynabook Satellite B450/B Replacement Battery PA3788U-1BRS 10.8V 4400mAh
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Toshiba Dynabook Satellite B450/B Replacement Battery PA3788U-1BRS 10.8V 4400mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Toshiba Dynabook Satellite B450/B Replacement Battery PA3788U-1BRS 10.8V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
4400mAh
Toshiba Dynabook Satellite B450/B Series — 10.8V Li-ion Replacement Battery (PA3788U-1BRS)
This is a 10.8V, 4400mAh (47.52Wh) lithium-ion battery for the Toshiba Dynabook Satellite B450/B and related B-series business notebooks. It cross-references OEM part numbers PA3788U-1BRS, PABAS223, PA3787U-1BRS, and PABAS221. The physical dimensions are 206.90 × 45.00 × 20.10mm — confirm your bay size before ordering.
- B450/B, B452/F, B550/B, B551/E shared platform: These Dynabook B-series models run the same 10.8V battery rail, use an identical multi-pin connector, and share the same BMS handshake protocol — which is why one part number covers the full range.
- Bench tested on actual hardware: We ran this cell through charge and discharge on a B-series unit. The BMS initialised correctly, reported cell voltage within expected range, and the protection circuit tripped cleanly at low-voltage cutoff without false-positive shutdowns.
- Post-install calibration on Dynabook B-series: After fitting, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that frequently appears after a cell swap on these models.
BIOS reporting poor battery health after replacement on Dynabook B-series
The Dynabook B450/B BIOS reads health data stored in the battery's EEPROM. When a new cell is installed, the EEPROM data doesn't match the BIOS's learned history from the old pack, so it flags the battery as degraded or unknown. This is a calibration state, not a hardware fault. One complete discharge-to-hibernate followed by an uninterrupted full charge gives the BIOS enough data to re-learn the new cell and clear the warning.
Laptop shuts down abruptly at 20–30% charge shown on screen
This happens when the fuel gauge IC hasn't been calibrated against the new cell yet. The gauge miscalculates remaining capacity, and the laptop cuts power before the true low-voltage threshold is reached. It's not a faulty battery — it's the IC working from stale reference data. Run two full discharge-to-hibernate and full recharge cycles, then verify the laptop reaches shutdown no earlier than 5–7% indicated charge.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Toshiba
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
Why does Windows show the new battery as "0% available (plugged in, not charging)" right after install on a Dynabook B450/B?
This usually means the BIOS hasn't completed its initial handshake with the new cell's EEPROM data. Remove the AC adapter, wait 30 seconds, reconnect, then allow the laptop to charge without interruption. If the gauge stays at 0%, power off completely, re-seat the battery, and restart — the BIOS re-reads the cell on cold boot and typically resolves the stuck reading.
The Dynabook B550/B shows the correct Wh rating in Device Manager but a completely different figure in Toshiba's battery utility — which one is right?
The Device Manager figure pulls the rated Wh from the battery's EEPROM (47.52Wh for this cell). The Toshiba utility calculates actual Wh based on the fuel gauge IC's current read of voltage and estimated capacity — these diverge until the gauge is calibrated. After two full discharge-recharge cycles the utility figure should settle close to 47Wh. The EEPROM value in Device Manager is the reference spec.
Charge stops at 80% and won't go higher on the Dynabook B451 — is the replacement cell defective?
It's almost certainly a BIOS-controlled charge limit, not a cell fault. Some Dynabook B-series units ship with an eco-charge mode enabled in the BIOS that caps charging at 80% to reduce cell stress over time. Enter BIOS setup (F2 at boot), navigate to the Power Management or Battery section, and disable the charge limit or set the threshold to 100%. The battery itself has no internal cap at 80%.
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