Packard Bell EasyNote A5 SQU-409 Replacement Battery 10.8V 4400mAh
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Packard Bell EasyNote A5 SQU-409 Replacement Battery 10.8V 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.
Packard Bell EasyNote A5 SQU-409 Replacement Battery 10.8V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
4400mAh
Packard Bell EasyNote A5 / A7 Series — 10.8V Li-ion Replacement Battery (SQU-409)
This is a 10.8V, 4400mAh (47.52Wh) Li-ion battery for the Packard Bell EasyNote A5, A5340, A7, and A7145 notebook computers. It replaces OEM part numbers SQU-409, SQU-416, DHS5, and several related part numbers listed on the original pack. Fit is confirmed against the physical connector, cell arrangement, and BMS handshake protocol used across this EasyNote series.
- EasyNote A5 and A7 platform compatibility: These models share the same 10.8V three-cell-series architecture and use the same SMBus communication lines between the battery BMS and the motherboard. A pack that negotiates correctly on the A5 will negotiate identically on the A7 and A7145 without firmware differences.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on an EasyNote A5340, confirmed full SMBus handshake, verified the BMS held voltage above the 9.0V low-cutoff threshold under display-plus-CPU load, and checked that the charger circuit terminated at 12.6V as expected.
- Post-install discharge cycle on EasyNote units: After fitting this pack, run the laptop on battery until it reaches hibernate-cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to register the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the EasyNote A5 shuts down at 20–30% battery remaining
The EasyNote A5 relies on the fuel gauge IC inside the battery pack to estimate remaining capacity. When cells age, they develop a steep voltage cliff — voltage drops sharply below 10.4V, which the motherboard reads as a critical low-battery event and triggers an immediate shutdown, even though the OS gauge still shows 20–30%. A replacement pack with fresh cells has a flatter discharge curve, so voltage stays above the shutdown threshold much further into the cycle. After two or three full calibration cycles, the fuel gauge IC recalibrates and the displayed percentage will track the actual remaining capacity accurately.
BIOS reporting new battery health as "poor" or "unknown" immediately after swap
The BIOS reads health data stored in the battery pack's EEPROM, which holds cycle count, rated Wh, and a health flag written by the previous charge controller. On a new pack, the EEPROM may show zero cycles but a health flag that conflicts with BIOS expectations, triggering a "poor" or "unknown" status on first boot. This is a calibration state, not a fault. Run one full discharge to hibernate-cutoff followed by an uninterrupted charge to 100% — after this learn cycle, the BIOS will update its health register and display the correct status.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Packard Bell
- 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 EasyNote A5 battery percentage jumps around — shows 60%, then suddenly 15% without warning. Is the new pack faulty?
The fuel gauge IC inside the pack needs calibration cycles against the new cells before it tracks accurately. The EEPROM data from the previous pack is gone, so the gauge is estimating against default cell parameters until it maps the actual discharge curve. Run two full discharge-to-hibernate-cutoff cycles followed by uninterrupted charges to 100%. After the second cycle, the fuel gauge will have enough data points to report remaining capacity within a few percent.
Windows shows this battery's capacity as lower than the rated 47.52Wh in the system info panel. Why does the number not match?
The Wh figure Windows reads comes from the rated design capacity stored in the pack's EEPROM, which reflects the OEM cell specification rather than the chemistry of the replacement cells. The actual deliverable energy may differ slightly from that stored value, so a small discrepancy in the system info panel is expected and does not affect charge behaviour. The charger circuit on the EasyNote A5 controls charge termination by voltage — 12.6V full charge — not by the Wh value displayed in software. No action is needed; the figure in the system panel is a stored label, not a live measurement.
The EasyNote A7 stopped charging after about 80% and the charge light went out. Is the battery at fault?
The EasyNote A7 motherboard firmware includes a BIOS-controlled charge limit that can activate if the battery health register has not been initialised after a cell swap. The charger terminates early because the BIOS interprets the unrecognised EEPROM state as a worn cell requiring conservative charging. Run a full discharge to hibernate-cutoff, then plug in and allow an uninterrupted charge. Once the BIOS completes the battery learn cycle, the charge limit lifts and the pack charges to the full 12.6V termination voltage.
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