Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Acer Aspire L51 Replacement Battery 14.4V 4400mAh BTP-52EW

Up to 19% off
New arrival
From $89.99 USD $110.99
Shipping calculated at checkout.
Fits Acer Aspire L51 series notebooks; replaces OEM part number BTP-52EW.
14.4V and 4400mAh capacity delivers 63.36Wh to sustain full CPU and display load on the L51 platform.
Connector seats flush into the L51 battery slot with a locking tab that clips down on both sides for secure retention.
We bench tested this cell against the L51 charging circuit; the BMS accepted the handshake on first insertion and held voltage stable under sustained load discharge.
After installation, run one full discharge cycle to hibernate cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear 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
WECARE5
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

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.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

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

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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.

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

14.4V

Amp

4400mAh

Acer Aspire L51 — 14.4V Li-ion Replacement Battery (BTP-52EW)

This is a 14.4V 4400mAh (63.36Wh) lithium-ion replacement battery for the Acer Aspire L51 series notebook. It uses OEM part number BTP-52EW and mounts directly into the L51 battery bay. Install it when the original cell no longer holds a usable charge or fails to register in the BIOS.

  • Aspire L51 compatibility: The L51 series uses a shared 14.4V battery rail with a specific connector keyed to BTP-52EW. The BMS in these machines handshakes with that part number during POST — mismatched cells trigger an immediate health warning regardless of actual charge state.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an L51 chassis. The BMS accepted the cell without error codes, charge current ramped correctly from bulk to taper phase, and the fuel gauge IC registered capacity within normal calibration range by the third cycle.
  • Post-install discharge cycle on the L51: After fitting this battery, run the laptop on battery power only until it hibernates at the BIOS low-voltage cutoff — do not force shutdown. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false health warning that appears after any cell swap on this platform.

BIOS reporting poor battery health immediately after installation on the L51

The Aspire L51 BIOS stores battery health data in EEPROM tied to the original cell's cycle count and rated Wh. When a new cell is fitted, that EEPROM data is stale — the BIOS reads it against the new cell and flags a mismatch as poor health. This is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% gives the fuel gauge IC enough data to overwrite the old EEPROM baseline. After two to three cycles the health indicator normalises.

Laptop shutting down at 20–30% charge shown on the L51

This happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The percentage display is pulled from the old cell's discharge profile, so the reported figure does not match the actual remaining voltage. Under full CPU and display load the cell hits its real low-voltage floor — around 10.8V for a 14.4V 4-cell pack — before the gauge reaches zero, and the BIOS cuts power immediately. Run two complete discharge-to-hibernate and full-recharge cycles without interruption. By the third cycle the gauge IC recalibrates to the new curve and the shutdowns stop.

Compatible Models

L51

Replaces Part Numbers

BTP-52EW

Technical Specifications

Voltage14.4V
Amp Hours4400mAh
Capacity4400mAh
Rate63.36Wh
Net Weight403g /14.22 oz
Gross Weight583g /20.56 oz
Approximate Weight583g /20.56 oz
Dimension 175.00 x 118.00 x 48.00mm

Product Highlights

  • Brand: Acer
  • Manufacturer: CS
  • Series: Standard
  • Color: Grey
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Aspire L51 BIOS shows the new battery as 0% and won't start charging — what's happening?

The fuel gauge IC on the L51 can lose communication with a new cell if the battery was deeply discharged before installation or during shipping. Connect the AC adapter and leave the laptop closed for 30 minutes before attempting to boot — the charger circuit will push a trickle current through the cell even with the system off. If the cell voltage recovers above approximately 10.8V, the BMS will re-initialise and normal charge current will resume.

System information shows the wrong Wh rating for this battery — it lists a different capacity than the 63.36Wh on the label.

The Wh figure shown in Windows or the BIOS comes from EEPROM data written to the original cell at manufacture. A replacement cell carries its own EEPROM value, which may differ slightly from what the old cell reported — this is a data field difference, not a physical capacity difference. The actual charge capacity of the cell is 63.36Wh as rated. Run the battery learn cycle — one full discharge to hibernate cutoff, then a full uninterrupted charge — and the system will recalculate the displayed Wh against the new cell's measured output.

The L51 charges the replacement battery to 80% then stops — the charge light goes solid and nothing moves.

Some Acer BIOS versions include a charge-limit setting that caps charging at 80% to reduce long-term cell stress. This is a firmware control, not a fault in the battery or charger. Open the BIOS setup utility on boot, navigate to the Power or Battery section, and check for a "Battery Care" or "Charge Limit" option — disable it or set the threshold to 100%. Save and reboot, then reconnect the adapter and the charge should continue past 80% to full.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Xeron Sonic Pro X155G Replacement Battery, 14.4V, 4400mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections