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Powerspec 1520 Replacement Battery 11.1V 5400mAh Li-ion

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From $88.99 USD $109.99
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Fits Powerspec 1520 and PowerSpec 1720 notebooks; replaces OEM battery CS-CLH571NB.
11.1V and 5400mAh capacity delivers sustained power for CPU and display loads without mid-cycle voltage drop.
Connector type matches original slot; no adapter or modification needed for physical installation.
We bench-tested this cell on a 1520 under full CPU load — BMS held voltage curve stable through discharge cycle.
After install, run one full discharge to hibernation then charge uninterrupted to 100% to reset the BIOS battery learn cycle and clear the inaccurate health warning that appears after cell replacement.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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

11.1V

Amp

5400mAh

Powerspec 1520 / 1720 — 11.1V Li-ion Replacement Battery

This is an 11.1V, 5400mAh (59.94Wh) Li-ion battery for the Powerspec 1520 and Powerspec 1720 notebooks. It replaces a dead or degraded original cell and restores unplugged operation. Voltage, connector, and BMS communication match the OEM spec for both models.

  • 1520 and 1720 compatibility: Both models run the same 11.1V three-cell Li-ion battery rail with an identical connector and BMS handshake protocol. One replacement cell covers both platforms without modification.
  • Bench tested on actual hardware: We cycled this cell through charge, full load discharge, and BMS cutoff on a Powerspec 1520. The protection circuit tripped correctly at low-voltage threshold and charge termination hit 12.6V as expected.
  • Post-install calibration on the Powerspec: After fitting, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting a new cell

The Powerspec BIOS stores battery health data from the previous cell in EEPROM. When a new cell goes in, the BIOS compares live readings against that stale data and flags the battery as degraded — even when the cell is brand new. This is not a fault with the replacement. One full discharge-to-hibernate followed by an uninterrupted charge to 100% triggers the learn cycle and rewrites the EEPROM reference values. After two or three cycles, the health indicator reads accurately.

Powerspec 1520 shutting down unexpectedly at 20–30% charge shown

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge reports 25% remaining while the cell voltage has already dropped below the safe operating threshold under full CPU and display load. The laptop shuts down to protect the cell, not because the battery is faulty. Run two full discharge-to-hibernate and full recharge cycles — after that, the fuel gauge IC recalibrates and the shutdown behaviour stops. Confirm the cell is charging to 12.6V at the termination point.

Compatible Models

Powerspec 1520 PowerSpec 1720

Technical Specifications

Voltage11.1V
Amp Hours5400mAh
Capacity5400mAh
Rate59.94Wh
Net Weight325g /11.46 oz
Gross Weight475g /16.76 oz
Approximate Weight475g /16.76 oz
Dimension 137.80 x 75.00 x 22.30mm

Product Highlights

  • Brand: Powerspec
  • 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

My Powerspec 1520 shows the battery as "unknown" or 0% in Windows right after I put the new battery in — is it dead?

No — the fuel gauge IC on the Powerspec reads EEPROM data from the old cell and cannot yet map that against the new one, so it reports 0% or unknown. Plug in the charger, let it charge uninterrupted to 100%, then run one full discharge to hibernate cutoff. After that first complete cycle, the fuel gauge IC has a reference curve for the new cell and the percentage reads correctly.

The replacement battery shows 47Wh in Windows system info but the spec says 59.94Wh — did I get the wrong battery?

The Wh figure Windows reports pulls from EEPROM data embedded in the battery's communication circuit, and that value is set against the original cell's rated chemistry, not recalculated after installation. The physical cell capacity is 59.94Wh as specced. Run two full charge and discharge cycles — on some Powerspec units the EEPROM value updates after calibration cycles; on others the displayed Wh figure stays static but actual runtime reflects the true 5400mAh capacity regardless.

New battery charges to about 80% and then stops — charger light goes green but the laptop shows it's not full.

The Powerspec BIOS includes a firmware-controlled charge limit that caps charging at 80% when the battery health record looks degraded. Because the BIOS still holds health data from the old cell, it applies that cap to the new one. Clear the learn cycle: discharge fully to hibernate cutoff, then hold the power button for 15 seconds with the battery removed and AC connected, reinstall the battery, and charge uninterrupted. This resets the BIOS charge threshold and the cell should reach 12.6V at termination.

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