Acer Aspire 1640LC Compatible Battery 14.8V 4400mAh
This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 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.
Acer Aspire 1640LC Compatible Battery 14.8V 4400mAh - 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.
Acer Aspire 1640LC Compatible Battery 14.8V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
14.8V
Amp
4400mAh
Acer Aspire 1640LC / 1691 Series — 14.8V Li-ion Replacement Battery (BT.T5005.002)
This is a 14.8V, 4400mAh (65.12Wh) Li-ion battery for Acer Aspire notebooks. It fits the Aspire 1640LC, 1691, 3002NWLCi, 5001WLCi, and hundreds of related Aspire models. Cross-references include BT.T5005.002, LC.BTP03.003, SQU-401, SQU-525, and BTP-AS1681 among others.
- Aspire 1640 / 1691 platform fit: These Aspire models share a common 14.8V four-cell battery rail and identical connector pinout. The BMS handshake runs at the same SMBus address across the range, so one cell pack covers the full compatibility list without firmware conflicts.
- Bench tested on actual hardware: We ran this cell on an Aspire 1691 chassis. The BMS initialised on first connect, charge current ramped normally through CC phase, and the cell reached 16.8V before the charger stepped down to CV taper. No overcurrent trip or false fault flags observed.
- Post-swap calibration — Aspire BIOS learn cycle: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Aspire notebooks.
BIOS reporting battery health as poor immediately after replacement
The Aspire BIOS reads health data from EEPROM registers stored in the old cell's fuel gauge IC. When a new cell arrives, those registers are blank or pre-loaded with factory defaults that do not match the BIOS's expected signature. The system flags this as degraded or unknown health. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — this forces the BIOS to rewrite its learned capacity baseline against the new cell's actual chemistry.
Laptop shuts down at 20–30% charge shown on screen
This is a voltage cliff issue, not a calibration glitch. Under full CPU and display load, cell voltage sags faster than the fuel gauge IC can track — the pack hits the low-voltage cutoff threshold while the OS still shows charge remaining. It appears most on Aspire models that have never had a calibration cycle run on the new cell. Discharge fully to hibernate, charge to 100% without interruption, then check whether the OS fuel gauge tracks correctly above 3.2V per cell under load.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Acer
- 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 Aspire shows the replacement battery as "0% available (plugged in, charging)" and never moves — what's happening?
The fuel gauge IC on the new cell has not yet synced its state-of-charge registers with the Acer BIOS. This is an EEPROM handshake gap, not a faulty battery. Discharge the laptop fully to hibernate cutoff, then charge uninterrupted to 100% without waking the machine. After one complete cycle, the BIOS rewrites its baseline and the percentage reading will track correctly.
Windows Battery Report shows this cell as 40Wh design capacity but the product lists 65.12Wh — which is right?
The 65.12Wh figure from the product data is the actual cell chemistry rating. The lower Wh figure in Windows comes from the EEPROM on the battery PCB, which stores a rated value that may differ from the physical cell installed. After one or two full charge-discharge cycles, the fuel gauge IC recalculates full-charge capacity against real measured data and the reported Wh figure will adjust upward toward the actual cell rating.
The Aspire charges to 80% then stops — adapter light stays green but percentage won't move past 80%
This is almost always a BIOS-controlled charge limit, not a cell fault. Several Acer Aspire BIOS versions include a battery health charging mode that caps charge at 80% to reduce cycle stress. Check BIOS setup under Power or Battery settings and disable the charge limit or switch to "maximum capacity" mode. If no such setting exists, check whether Acer Care Center software is installed — it can enforce the 80% cap from within Windows independently of the BIOS.
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.






