Acer Aspire 5550 Compatible Battery 11.1V 4400mAh BTP-ASJ1
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Acer Aspire 5550 Compatible Battery 11.1V 4400mAh BTP-ASJ1 - 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
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Acer Aspire 5550 Compatible Battery 11.1V 4400mAh BTP-ASJ1 - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4400mAh
Acer Aspire 5550 / TravelMate 6252 — 11.1V Li-ion Replacement Battery (BTP-ASJ1)
This is an 11.1V, 4400mAh (48.84Wh) Li-ion replacement battery for the Acer Aspire 5550 and a wide range of related Acer notebook models including the TravelMate 6252, Aspire 5590, and Aspire 3628NWXMi. It cross-references over 50 OEM part numbers, including BTP-ASJ1, BT.00604.006, and GARDA32. The cell replaces the original pack when capacity fade or failure has cut your laptop's mobile use.
- Aspire/TravelMate platform fit: These Acer models share a common 11.1V three-cell serial architecture, identical connector pinout, and the same BMS communication protocol — which is why one part number covers such a broad range of machines from this era.
- Bench tested on actual hardware: We cycled this cell through full charge-discharge sequences and confirmed the BMS handshake completed correctly, charge termination triggered at the right cutoff voltage, and protection circuits tripped cleanly on simulated over-discharge.
- First-cycle calibration on Acer laptops: After installing, run one full discharge until the laptop hibernates on low battery, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on Acer notebooks.
BIOS reporting poor battery health immediately after fitting the new cell
Acer's BIOS reads health data from EEPROM stored on the battery's BMS board. When you fit a new cell, the EEPROM contains rated factory data that doesn't match the charge history the BIOS expects to see. The system flags this mismatch as degraded or unknown health. Running one full discharge-to-hibernate followed by an uninterrupted full charge gives the BIOS enough cycle data to recalculate and clear the warning. Most Aspire 5550 units resolve the health flag within two to three calibration cycles.
Laptop shuts down abruptly while the gauge still shows 20–30% remaining
This happens when the fuel gauge IC hasn't calibrated its discharge curve against the new cell's actual chemistry. The IC is still using the old cell's voltage-to-capacity mapping, so it misjudges where the real voltage cliff sits. Under full CPU and display load, the cell hits its actual low-voltage cutoff before the OS gauge reaches 0%. Run two full discharge cycles — letting the laptop hibernate each time — and the fuel gauge IC re-maps the curve against the new cell, pushing the false shutdown point back to near zero.
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
Why does my Acer Aspire 5550 show "0% available (plugged in, charging)" right after I put in the new battery?
The BIOS is reading EEPROM data from the new cell's BMS board and can't reconcile it with the laptop's stored charge history — so it reports 0% or unknown state rather than guessing wrong. This isn't a fault with the cell. Plug in the charger, let it charge uninterrupted to 100%, then run a full discharge to hibernate. After one or two of those cycles the BIOS recalibrates and the percentage reads correctly.
The Aspire 5550 says the battery is at 48Wh in BIOS but Windows reports a different Wh figure — which one is right?
The BIOS figure comes from the rated Wh value stored in the cell's EEPROM at manufacture — 48.84Wh in this case, matching the cell spec. Windows calculates Wh dynamically from the fuel gauge IC's real-time voltage and current readings, which drift until the IC calibrates against the new cell. The two numbers converge after two to three full discharge-charge cycles. If they still disagree after that, check Windows Battery Report (`powercfg /batteryreport`) and compare Design Capacity against Full Charge Capacity.
My replacement battery stopped charging at 80% and won't go higher — is the cell defective?
Most likely not. Acer's firmware on several Aspire and TravelMate models includes a BIOS-controlled charge limit that caps at 80% when battery health data looks uncertain or after certain update revisions — this is a firmware decision, not a cell fault. Check the Acer Care Center or Power Management settings in Windows for a charge limit toggle. If no toggle is present, enter BIOS setup and look under the Power or Battery section for a charge threshold setting and set it to 100%.
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