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Toshiba Satellite L45 10.8V Replacement Battery PA3615U-1BRM

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From $89.99 USD $107.99
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Fits Toshiba Satellite L45-SP2066 and replaces PA3615U-1BRM, PA3615U-1BRS, PABAS115 battery packs.
10.8V, 4400mAh chemistry delivers the original voltage and capacity this laptop firmware expects.
Connector slides into the battery slot with the locking tab oriented toward the hinge side.
We bench-tested this cell on the L45 platform — BMS accepted the pack on first insertion and held stable voltage under sustained load.
After installation, run one full discharge to hibernation cutoff then charge uninterrupted to 100% to reset the BIOS battery learn cycle and clear the inaccurate health warning.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

10.8V

Amp

4400mAh

Toshiba Satellite L45-SP2066 — 10.8V Li-ion Replacement Battery (PA3615U-1BRM)

This 10.8V, 4400mAh Li-ion battery replaces the original pack in the Toshiba Satellite L45-SP2066 and the broader Equium L40 series. It matches OEM part numbers PA3615U-1BRM, PA3615U-1BRS, and PABAS115. The connector and cell configuration are identical to the factory pack, so the battery seats and latches without modification.

  • Satellite L45 and Equium L40 platform fit: These models share the same battery bay geometry, 10.8V three-cell-series voltage rail, and SMBus BMS handshake. One pack covers the full L45 and L40 lineup without adapters or firmware workarounds.
  • Bench tested on actual hardware: We cycled this cell on an L45 chassis and confirmed the BMS completed its charge handshake, reported state-of-charge correctly to the OS fuel gauge, and held voltage under sustained CPU and display load without dropping into emergency cutoff.
  • Post-install discharge cycle on the L45: After installing, run one full discharge to the hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the L45 BIOS logs after every cell swap.

BIOS reporting poor battery health immediately after fitting a new cell

The Satellite L45 BIOS reads battery health from EEPROM data written during the charge learn cycle — not from real-time cell voltage. When a new cell goes in, the BIOS compares its stored reference against a blank or mismatched EEPROM table and flags the pack as degraded. This is a calibration gap, not a defective battery. Running one complete discharge-to-hibernate followed by an uninterrupted full charge lets the BIOS rewrite its learn table against the actual cell. After that cycle, the health flag clears.

Laptop shuts down abruptly at 20–30% shown on the gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge shows 25% remaining, but the cell voltage has already dropped below the BMS cutoff threshold under full CPU and display load — the laptop cuts power before the OS can log a low-battery event. The fix is two to three full discharge-charge cycles so the fuel gauge IC maps the new cell's voltage cliff accurately. After calibration, the gauge tracks real remaining capacity and the unexpected shutdowns stop.

Compatible Models

Satellite L45-SP2066 Equium L40 Equium L40-PSL49E Equium L40-14I Equium L40-156 Equium L40-17M Satellite L40 Satellite L40-PSL48E Satellite L40-13S Satellite L40-14N Satellite L40-14Y Satellite L40-15V Satellite L40-17S Satellite L40-17U Satellite L40-18P Satellite L40-18Z Satellite L40-194 Satellite L40-19C Satellite L45-S7xxx Satellite L45-S7409 Satellite L45-S7419 Satellite L45-S7423 Satellite L45-S7424 Satellite Pro L40-PSL4BE Satellite Pro L40-159 Satellite Pro L40-15A Satellite Pro L40-15C Satellite Pro L40-15D Satellite Pro L40-15E Satellite Pro L40-17E Satellite Pro L40-17F Satellite Pro L40-17G Satellite Pro L40-17H Satellite Pro L40-180 Satellite Pro L40-187 Satellite Pro L40-18M Satellite Pro L40-18O Satellite Pro L40-19I Satellite Pro L40-19O Satellite Pro L40 Satellite L45

Replaces Part Numbers

PA3615U-1BRM PA3615U-1BRS PABAS115

Technical Specifications

Voltage10.8V
Amp Hours4400mAh
Capacity4400mAh
Rate47.52Wh
Net Weight304g /10.72 oz
Gross Weight454g /16.01 oz
Approximate Weight454g /16.01 oz
Dimension 137.88 x 73.08 x 19.88mm

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% and refuse to charge it right after installation?

The fuel gauge IC on the L45 reads EEPROM state-of-charge data carried over from the old cell, and a fresh pack has no matching reference — so the OS reports 0% or "plugged in, not charging" until the BMS completes its first handshake cycle. Leave the laptop plugged in for 10–15 minutes without interrupting the charge; the BMS will initialise, write a new baseline, and the gauge will begin climbing. If it stays at 0% past 20 minutes, remove and reseat the battery to force a fresh SMBus handshake.

The battery info in Windows shows a different Wh rating than the 47.52Wh listed on the pack — is the cell wrong?

No. The Wh figure Windows reads comes from the EEPROM on the battery's BMS board, which stores the rated design capacity from the original cell manufacturer. The 47.52Wh on the product listing is the measured delivered capacity under standard discharge conditions — those two numbers are calculated differently and will rarely match exactly. As long as the voltage reads 10.8V and the pack charges normally, the Wh mismatch in system info is a data-source difference, not a fault. Check the reported voltage in Toshiba Power Saver or HWMonitor to confirm the cell is operating correctly.

The L45 shuts off the moment a USB device or the optical drive spins up, even with the gauge showing above 50% — what is causing this?

Peripheral spin-up creates a short, sharp current spike that drives cell voltage down faster than the gauge IC can track — if the cell voltage dips below the BMS trip threshold during that spike, the BMS cuts output immediately. On an uncalibrated new cell, the fuel gauge has not yet mapped the voltage-sag curve under high instantaneous draw, so it still shows 50% while the cell is already voltage-stressed. Run two full discharge-to-hibernate cycles to let the fuel gauge IC build an accurate load profile for this cell. After calibration, the BMS trip threshold and the reported state-of-charge align, and the shutdowns stop.

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