Acer Extensa 5635Z Replacement Battery 11.1V 4400mAh AS09C31
This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.
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Acer Extensa 5635Z Replacement Battery 11.1V 4400mAh AS09C31 - is backordered and will ship as soon as it is back in stock.
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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 Extensa 5635Z Replacement Battery 11.1V 4400mAh AS09C31 - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4400mAh
Acer Extensa 5635Z Series — 11.1V Li-ion Replacement Battery (AS09C31)
This 11.1V 4400mAh (48.84Wh) Li-ion battery replaces the original cell in the Acer Extensa 5635Z and its 422G16Mn, 432G16Mn, and 432G25Mn variants. It cross-references OEM part numbers AS09C31, AS09C70, AS09C71, AS09C75, BT.00605.022, GRAPE32, LC.BTP00.005, LC.BTP00.011, LC.BTP00.066, and TM00741. Physical dimensions are 203.65 × 48.00 × 27.11mm — verify before ordering if your chassis differs.
- Extensa 5635Z platform fit: These models share a common 11.1V three-cell rail, identical connector pinout, and the same BMS handshake protocol — which is why one cell covers the full 5635Z sub-range without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the 5635Z platform. The BMS negotiated correctly on first insertion, charge termination triggered cleanly at 12.6V, and no protection trips occurred during load testing across CPU-plus-display draw.
- First-cycle calibration on the 5635Z: After installing, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that typically appears after every cell swap on this platform.
BIOS reporting battery health as poor immediately after replacement
The Extensa 5635Z BIOS reads EEPROM data carried over from the old cell and flags the new battery as degraded before it has completed a single cycle. This is a data mismatch, not a fault with the replacement cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — the BIOS battery learn cycle rewrites its reference values against the new chemistry. After two to three cycles the health indicator normalises.
Laptop shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. Under combined CPU and display load, actual cell voltage drops below the protection threshold before the OS gauge reaches 0% — the BMS cuts power to prevent over-discharge. The gauge and the real voltage are out of sync. Force a full discharge to hibernate-cutoff, then charge fully to 100%; repeat for two cycles until the gauge tracks actual cell voltage accurately, typically from around 11.1V down to the 9.0V cutoff.
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 Extensa 5635Z shows 0% and "plugged in, not charging" right after fitting the new battery — what's wrong?
The BIOS is reading stale EEPROM data from the previous cell and has locked the charge circuit as a precaution. Shut the laptop down completely, remove the AC adapter for 30 seconds, then reconnect and power on. If the fault persists, enter BIOS setup, let the system sit on that screen while plugged in for two minutes, then reboot — this forces a fresh handshake between the BMS and the charge controller.
Windows is reporting 48Wh but Device Manager shows a different Wh figure — which is correct?
The figure in Device Manager pulls from the EEPROM on the old cell if a full learn cycle hasn't run yet — it does not reflect the actual chemistry of the replacement. The authoritative spec for this cell is 48.84Wh at 11.1V. Run a full discharge to hibernate-cutoff followed by an uninterrupted charge to 100%; after that cycle the reported Wh value in Device Manager will update to match the new cell's rated capacity.
The battery charged to 80% and stopped — the indicator just sits there and won't move. Is the cell faulty?
On the Extensa 5635Z, the BIOS can enforce a charge-limit threshold if it previously recorded a degraded cell and has not yet completed a learn cycle with the new one. This is a firmware behaviour, not a cell fault. Run a full discharge to hibernate, then plug in and allow an uninterrupted charge — do not suspend or sleep the laptop during this cycle. Once the BIOS registers a clean full charge at 12.6V termination, the 80% ceiling clears.
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