Toshiba Satellite NB300 Replacement Battery 10.8V 6600mAh
This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.
WECARE5
Check that your old battery model number and device model to match our description. This makes sure they work together.
We ship your order same day if you buy it before 4 PM EST.
Toshiba Satellite NB300 Replacement Battery 10.8V 6600mAh - is backordered and will ship as soon as it is back in stock.
Let customers speak for us
Send Your Battery Photo
Expert Technician Help
Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.
POST YOUR BATTERY IMAGE
Product & Solutions Expert
✉ sales@batteryweb.com
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 Satellite NB300 Replacement Battery 10.8V 6600mAh - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
6600mAh
Toshiba Satellite NB300 / NB305 — 10.8V Li-ion Replacement Battery (PA3783U-1BRS)
This is a 10.8V, 6600mAh (71.28Wh) Li-ion replacement battery for the Toshiba Satellite NB300 series netbook. It fits the Satellite NB300, NB305, NB305-N410BL, and Satellite N302, among other models in the same family. It replaces OEM part numbers PA3783U-1BRS, PA3785U-1BRS, PABAS218, and PABAS220.
- NB300 / NB305 family fit: These models share the same connector pinout, voltage rail, and BMS handshake protocol across the series. A single cell works across all of them without adapter or modification.
- Bench tested on actual hardware: We cycled this battery through charge and discharge on the NB300 platform. The BMS communicated correctly with the Toshiba firmware — no fault codes, no charge interruptions, and the protection circuit tripped cleanly at low-voltage cutoff as expected.
- First-cycle calibration on the NB300: After installing, run one full discharge until the laptop hibernates on low battery, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears in Toshiba system tools after a cell swap.
Why the NB300 BIOS reports poor battery health immediately after replacement
The Toshiba BIOS stores charge-cycle history and health data in EEPROM on the original cell. When a new cell is installed, that EEPROM data is gone. The BIOS reads the blank or mismatched register and flags the battery as degraded or unknown — even if the new cell is at full capacity. This is a firmware read issue, not a hardware fault. Running one complete discharge-to-hibernate followed by an uninterrupted full charge gives the BIOS a fresh data point and typically clears the warning within two cycles.
NB300 shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC hasn't yet calibrated against the new cell's actual voltage curve. The gauge carries over reference points from the old, degraded cell and calls cutoff too early. Under combined CPU and display load, the laptop hits what looks like 20–30% but is actually near the cell's true low-voltage floor. Two to three full discharge-and-charge cycles recalibrate the fuel gauge IC. After calibration, the percentage shown should align with actual remaining capacity — confirm by watching the voltage hold above 10.8V under load.
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
The Toshiba system tools still show "poor battery health" two days after I installed the new battery — is the cell faulty?
The cell is almost certainly fine. The Toshiba BIOS pulls health data from EEPROM on the original battery, and that data doesn't transfer to a replacement cell. The BIOS reads the blank register and flags it as degraded. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100% — this gives the BIOS a new reference point and typically clears the health warning within two cycles.
My NB300 shows 71Wh on the battery info screen but the replacement is listed as 71.28Wh — did I get the wrong cell?
The Wh figure shown in Windows or Toshiba utilities is pulled from the EEPROM rated value on the old cell, not measured from the new one. A 0.28Wh difference is within normal rounding between the stored EEPROM value and the actual chemistry spec. The cell is correct — PA3783U-1BRS and PA3785U-1BRS are both valid OEM numbers for this platform and both cross to this replacement.
The NB300 fuel gauge is jumping around wildly — it reads 80%, then 45%, then 70% within minutes of unplugging
The fuel gauge IC recalibrates against the actual voltage discharge curve of a new cell, and it takes a few full cycles to lock in accurate readings. Until calibration is complete, the percentage can swing significantly. Run three complete discharge-to-hibernate cycles followed by uninterrupted charges to 100%. After the third cycle, the gauge should stabilise — if it's still erratic, check that AC adapter output is a steady 19V, as voltage fluctuation from the adapter also throws the fuel gauge off.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
