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Acer Aspire 3820T Replacement Battery 11.1V 4400mAh AS10B31

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From $71.99 USD $88.99
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Fits Acer Aspire 3820T and replaces OEM part numbers AS10B31, AS10B41, AS10B7E, AS10B5E, AS10B61, AS10B6E, AS10B3E, AS10B51, AS10E7E.
11.1V at 4400mAh delivers 48.84Wh — standard output for this ultrabook chassis without voltage sag under full CPU load.
Connector slides into the battery bay with the locking tab facing the hinge; orientation is keyed and will not seat reversed.
Bench testing showed clean BMS handshake on first charge cycle with no early cutoff or thermal throttle during discharge under sustained load.
On first boot after installation, run one full discharge to hibernation 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.
Extended delivery time

Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.

Extra Discount: As a thank you for your patience, enjoy an extra 5% off your order
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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

🔹 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: 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.

Voltage

11.1V

Amp

4400mAh

Acer Aspire 3820T Series — 11.1V Li-ion Replacement Battery (AS10B31)

This 11.1V, 4400mAh (48.84Wh) Li-ion battery replaces the original cell in the Acer Aspire 3820T and its variants, including the 3820T-5246, 3820T-7459, and 3820T-332G16N. It also cross-references OEM part numbers AS10B41, AS10B7E, AS10B5E, AS10B61, AS10B6E, AS10B3E, AS10B51, and AS10E7E. Physical dimensions are 268.73 x 21.45 x 23.33mm — confirm your tray matches before fitting.

  • Aspire 3820T platform fit: The 3820T family shares a common battery tray geometry, connector pinout, and BMS handshake across all sub-models in this series. Any unit carrying an AS10B-prefix OEM part number uses the same voltage rail and communication protocol, so one cell covers the full range.
  • Bench tested on actual hardware: We cycled this cell through charge, full-load discharge, and sleep-state draw on a 3820T unit. The BMS reported correct voltage at each charge threshold, and the protection circuit tripped cleanly at the low-voltage cutoff without requiring a manual reset.
  • BIOS learn cycle after installation: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. The 3820T BIOS uses this cycle to recalibrate its battery model against the new cell's actual capacity — skipping it leaves the health indicator stuck on the previous cell's data.

Why the Aspire 3820T BIOS flags a new battery as poor health immediately after swap

The 3820T stores battery health data in EEPROM on the original cell. When you fit a replacement, the BIOS reads that stored data and flags the new cell as degraded — because the EEPROM record belongs to the old cell, not the one now installed. This is a firmware behaviour, not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite the battery model against the new cell. After two to three cycles, the health indicator updates and the warning clears.

Laptop shuts down at 20–30% charge shown on screen

This happens when the fuel gauge IC's calibration is still mapped to the old cell's discharge curve. Under combined CPU and display load, the new cell's actual voltage drops faster than the gauge predicts, and the system hits the hardware cutoff before the percentage reaches zero. It is not a dead cell — it is a mismatch between the gauge's model and the new chemistry. Run two complete discharge cycles to hibernate cutoff, charging fully to 100% each time. After the second cycle, the fuel gauge IC recalibrates its curve and the shutdowns stop; confirm the cell holds above 10.5V under load before ruling out a deeper fault.

Compatible Models

Aspire 3820T Aspire 3820T-5246 Aspire 3820T-7459 Aspire 3820T-332G16N Aspire 3820T-332G32N Aspire 3820T-332G50N Aspire 3820T-333G25I Aspire 3820T-333G25N Aspire 3820T-333G32N Aspire 3820T-334G32n Aspire 3820T-334G50I Aspire 3820T-334G50n Aspire 3820T-352G16N Aspire 3820TG Aspire 3820TG-332G32?N Aspire 3820TG-332G50?N Aspire 3820TG-332G64?N Aspire 3820TG-333G25?I Aspire 3820TG-333G25?N Aspire 3820TG-333G32?N Aspire 3820TG-334G32?N Aspire 3820TG-334G50?N Aspire 3820TG-432G32?N Aspire 3820TG-432G50?N Aspire 3820TG-432G64?N Aspire 3820TG-434G32?I Aspire 3820TG-434G32?N Aspire 3820TG-434G50 Aspire 3820TG-434G50?N Aspire 3820TG-434G64?I Aspire 3820TG-434G64?N Aspire 3820TG-522G50?N Aspire 3820TG-524G50?N Aspire 3820TG-524G64?N Aspire 3820TG-528G50?N Aspire 3820TG-544G64?N Aspire 3820TG-624G50?N Aspire 3820TG-624G64?N Aspire 4820T Aspire 4820T-3697 Aspire 4820T-5570 Aspire 4820T-331G32M?N Aspire 4820T-332G25M?N Aspire AS4820T-332G32M?N Aspire 4820T-333G25Mn Aspire 4820T-333G32M?I Aspire 4820T-333G32M?N Aspire 4820T-333G50M?N Aspire 4820T-334G25M?N Aspire 4820T-334G32Mn Aspire 4820T-354G32M?N Aspire 4820T-432G32M?N Aspire 4820T-432G50M?N Aspire AS4820T-522G16M?N Aspire 4820T-522G50M?N Aspire 4820T-524G25M?N Aspire 4820TG Aspire 4820TG-3195 Aspire 4820TG-5637 Aspire 4820TG-7566 Aspire 4820TG-7805 Aspire 4820TG-332G16MN Aspire 4820TG-332G25MN Aspire 4820TG-332G32MN Aspire 4820TG-332G64MN Aspire 4820TG-333G25MI Aspire 4820TG-333G32MN Aspire 4820TG-334G16MN Aspire 4820TG-334G32MN Aspire 4820TG-334G50MN Aspire 4820TG-352G25MN Aspire 4820TG-353G32MN Aspire 4820TG-432G32MN Aspire 4820TG-432G50MN Aspire 4820TG-432G64MN Aspire 4820TG-433G32MI Aspire 4820TG-433G32MN Aspire 4820TG-433G64MN Aspire 4820TG-434G32MN Aspire 4820TG-434G50MN Aspire 4820TG-434G64MN Aspire 4820TG-436G64MN Aspire 4820TG-438G32MN Aspire 4820TG-522G32MN Aspire 4820TG-522G50MN Aspire 4820TG-522G64MN Aspire 4820TG-524G32MN Aspire 4820TG-524G50MN Aspire 4820TG-524G64MN Aspire 4820TG-526G64MN Aspire 4820TG-544G64MN Aspire 4820TG-5454G32MN Aspire 4820TG-5454G50MIKS Aspire 4820TG-5454G50MN Aspire 4820TG-5454G64MN Aspire 4820TG-5454G64MNKS Aspire 4820TG-624G16MNKS Aspire 4820TG-624G50MN Aspire 4820TG-624G64MN Aspire 4820TG-626G64MN Aspire 5820T Aspire 5820T-5452 Aspire 5820T-5900 Aspire 5820T-5951 Aspire 5820T-6178 Aspire 5820TG-5612 Aspire 5820T-7683 Aspire 5820T-332G16M?N Aspire 5820T-333G32M?I Aspire 5820T-333G32Mn Aspire 5820T-334G32M?I Aspire 5820T-334G32Mn Aspire 5820TG-334G50Mn Aspire 5820T-353G32MN Aspire 5820T-354G32MN Aspire 5820T-354G50MN Aspire 5820T-432G32M?N Aspire 5820T-434G32M?N Aspire 5820T-522G16M?N Aspire 5820T-524G16M?N Aspire 5820TGAspire 5820TG-332G32MN Aspire 5820TG-332G64MN Aspire 5820TG-333G50MN Aspire 5820TG-334G32MN Aspire 5820TG-354G50MN Aspire 5820TG-432G50MN Aspire 5820TG-432G64MN Aspire 5820TG-434G25MN Aspire 5820TG-434G32MI Aspire 5820TG-434G32MN Aspire 5820TG-434G50MI Aspire 5820TG-434G50MN Aspire 5820TG-434G64MI Aspire 5820TG-434G64MN Aspire 5820TG-438G50MN Aspire 5820TG-438G64MI Aspire 5820TG-438G64MN Aspire 5820TG-464G75MN Aspire 5820TG-522G50MN Aspire 5820TG-522G64MN Aspire 5820TG-524G25MN Aspire 5820TG-524G32MN Aspire 5820TG-524G50MN Aspire 5820TG-524G64MN Aspire 5820TG-528G64MN Aspire 5820TG-5454G64MNKS Aspire 5820TG-5464G50MNSS Aspire 5820TG-624G50MN Aspire 5820TG-624G64MN Aspire 5820TG-626G64MN

Replaces Part Numbers

AS10B31 AS10B41 AS10B7E AS10B5E AS10B61 AS10B6E AS10B3E AS10B51 AS10E7E

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight310g /10.93 oz
Gross Weight580g /20.46 oz
Approximate Weight580g /20.46 oz
Dimension 268.73 x 21.45 x 23.33mm

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 Aspire 3820T shows the battery as "0% available (plugged in, not charging)" right after fitting the new cell — what's happening?

The fuel gauge IC is reading EEPROM data written by the old cell and cannot yet map it to the new one, so it reports zero. Disconnect the AC adapter, let the laptop run on the new cell until it hibernates, then reconnect and charge uninterrupted to 100%. After one full cycle the IC resets its reference point and the percentage reads correctly.

Windows says the new battery has a different Wh rating than the original — is the cell underspec?

The Wh figure Windows reports is pulled from the EEPROM on the cell, which stores the rated design capacity, not the measured capacity under your specific load. A new cell's EEPROM value can differ from what the old cell reported without indicating a fault. Check that the cell is physically marked 11.1V and 4400mAh — if those values match the product data, the cell is correct and the Wh discrepancy is an EEPROM reporting difference, not a capacity shortfall.

The replacement battery charges but stops at 80% and will not go higher — is the BIOS capping it?

Some Acer BIOS versions include a charge-limit setting that caps charging at 80% to reduce cell wear — it is a firmware control, not a fault with the battery. Go into the BIOS or Acer Care Center and look for a "Battery Health Mode" or charge limit toggle. Disable it, save, and reboot. The cell will then charge to the full 11.1V terminal voltage.

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