Acer Aspire Timeline 3810T Compatible Battery 10.8V AS09D34
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Acer Aspire Timeline 3810T Compatible Battery 10.8V AS09D34 - 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 Aspire Timeline 3810T Compatible Battery 10.8V AS09D34 - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
4400mAh
Acer Aspire Timeline 3810T Series — 10.8V Li-ion Replacement Battery (AS09D34)
This 10.8V, 4400mAh (47.52Wh) Li-ion battery replaces the original cell in the Acer Aspire Timeline 3810T and 3810TZ series notebooks. It fits the full range of 3810T variants, from the 6415 to the 8640, covering over 190 compatible models. OEM part numbers include AS09D34, AS09D36, AS09D56, AS09D70, and AS09D71, among others.
- 3810T series fit: All 3810T and 3810TZ variants share the same 10.8V three-cell-series configuration, connector pinout, and BMS handshake protocol. A battery verified on the base 3810T communicates correctly with the EC on every sub-model in this family.
- Bench tested on actual hardware: We ran this cell on a 3810T unit and confirmed the BMS negotiated charge cycles without fault codes. The protection circuit responded correctly to both charge cutoff and low-voltage disconnect thresholds.
- First-cycle calibration on the 3810T: After fitting, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. The 3810T's BIOS uses this cycle to recalibrate its fuel gauge IC against the new cell's actual capacity, clearing the inaccurate health warning that appears after every cell swap.
Why the 3810T BIOS flags new cells as poor health immediately after swapping
The 3810T stores battery state data in EEPROM on the original cell. When a new cell goes in, the BIOS reads no charge history and flags the battery health as unknown or poor. This is not a fault with the replacement — it's a data gap the firmware cannot distinguish from a degraded cell. Run one full discharge-to-hibernate followed by a complete uninterrupted charge. After one to two of these learn cycles, the BIOS recalibrates and the health indicator updates correctly.
3810T shutting down at 20–30% charge shown on the gauge
This happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The gauge reports 20–30% remaining, but the cell voltage has already dropped below the BMS's cutoff threshold under CPU and display load combined. The firmware shuts the system down to protect the cell before the gauge catches up. Force a full discharge to hibernate, then charge to 100% without interruption — after two complete cycles the gauge aligns with actual cell voltage, and the early shutdowns stop.
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 3810T shows the battery as "0% available (plugged in, not charging)" right after fitting the new cell — what's wrong?
The BIOS is reading no usable EEPROM data from the new cell and locking the charge circuit as a precaution. Shut the laptop down fully, remove the AC adapter for 30 seconds, then reconnect and boot. If the gauge still reads 0%, force a full discharge to hibernate-cutoff, then charge uninterrupted to 100% — this initialises the fuel gauge IC against the new cell and restores normal charging behaviour.
Windows says the battery capacity is 38Wh but the product lists 47.52Wh — is this cell underspec?
No. Windows reads the Wh figure from EEPROM data the cell reports, and on a new cell that value reflects the rated chemistry baseline before calibration, not the measured capacity. After two full discharge-to-charge cycles, the fuel gauge IC updates its internal model and the reported Wh figure rises toward the actual 47.52Wh spec.
The charge stops at exactly 80% and won't go higher — is the BIOS limiting it?
Yes, on some 3810T units the Acer Power Management firmware enables a charge ceiling at 80% to reduce cell stress during long plugged-in sessions. Open Acer ePower Management (or Acer Care Center on updated installs), locate the Battery Health Mode or charge limit toggle, and set it to "Maximum Capacity" — charging will then proceed to 100%.
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