Asus A32-M9 W7J Replacement Battery 11.1V 4400mAh
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Asus A32-M9 W7J Replacement Battery 11.1V 4400mAh - 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.
Asus A32-M9 W7J Replacement Battery 11.1V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4400mAh
Asus W7J / M9J Series — 11.1V Li-ion Replacement Battery (A32-M9 / A32-W7)
This is an 11.1V, 4400mAh (48.84Wh) Li-ion battery for Asus W7J and M9J series notebooks. It replaces worn or failed cells under OEM part numbers A32-M9, A32-W7, A33-W7, A33-M9, and several 90-NDT1 / 90-NHQ2 variants. If your original battery no longer holds charge or the system shuts down unexpectedly while unplugged, this is the direct cell replacement.
- W7J, M9J, W7SG, and M9V compatibility: These models share the same three-cell 11.1V architecture, identical connector pinout, and the same BMS handshake protocol — which is why a single cell covers all of them without firmware conflict.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on an M9J unit. The BMS accepted full negotiation, charge current ramped correctly through CC and CV phases, and the protection circuit tripped cleanly at the low-voltage cutoff without needing a manual reset.
- Post-install calibration on the W7J: After fitting this battery, 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 this platform.
Why the W7J BIOS reports poor battery health immediately after a cell swap
The W7J BIOS reads health status from EEPROM data written by the original cell during its lifetime. A fresh cell has no accumulated cycle data, so the BIOS interprets blank or mismatched EEPROM values as a degraded battery. This is not a fault with the replacement cell. Running one full discharge-to-hibernate then a complete uninterrupted charge gives the BIOS enough data to rewrite its baseline. After one to two cycles, the health indicator updates to reflect the actual cell state.
Laptop shutting down at 20–30% charge shown on the W7J gauge
This happens when the fuel gauge IC has not yet calibrated against the new cell's discharge curve. The old curve is still in memory, so the percentage reading diverges from actual cell voltage under load — especially when CPU and display draw spikes. The cell voltage drops below the safe cutoff before the gauge reaches zero, triggering a hard shutdown. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100%; the gauge IC recalibrates and the shutdowns stop. After calibration, the low-battery warning should trigger accurately at around 10.5V under load.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Asus
- 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
The Asus W7J shows "plugged in, not charging" — the battery just sits at whatever percentage it was at when I plugged in. Is the new cell faulty?
This is almost always a BIOS charge limit or a stale power state, not a cell fault. Shut the laptop down completely — not sleep or hibernate — then unplug the AC adapter for 30 seconds before reconnecting and booting. On some W7J units, a stuck EC (embedded controller) state blocks charging until a full power cycle clears it. If the issue persists, enter the BIOS and confirm no charge threshold limit is active under the power management settings.
Windows is showing the battery capacity as 24Wh or some other wrong number — the product data says 48.84Wh. What's happening?
Windows reads the Wh figure from the EEPROM embedded in the battery's BMS, which stores the rated capacity of the original cells. A replacement cell with slightly different chemistry or a freshly written EEPROM may report a conservative designed-capacity value until the OS fuel gauge recalculates it from actual charge cycles. Run two complete discharge-to-100% charge cycles and Windows Battery Report will update the full-charge capacity to reflect what the cell actually delivers. Check with `powercfg /batteryreport` after the second cycle.
My W7J fuel gauge is jumping around — it reads 60%, then drops to 41%, then climbs back to 55% without any change in what I'm doing. How do I stop this?
The fuel gauge IC is still running the old cell's discharge curve against the new cell's actual voltage output. Until it has enough data points, the percentage estimate oscillates. This is normal for the first two to three cycles after a cell swap. Run the battery down to hibernate-cutoff twice in a row, charging fully between each cycle. After the second full cycle the fuel gauge IC locks onto the new curve and the jumping stops.
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