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Acer Aspire One UM08A73 Replacement Battery 11.1V 2200mAh

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From $29.99 USD $36.99
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Fits Acer Aspire One netbooks replacing UM08A73, UM08A72, UM08A74, M08B74, and AR5BXB63 battery packs.
11.1V lithium-ion cell with 2200mAh capacity delivers 24.42Wh to sustain the Aspire One's display and Atom processor through a full work cycle.
Connector slides into the rear battery bay slot with a single locking tab — orientation is keyed, no forcing required on insertion.
We bench-cycled this cell against an Aspire One A110 and confirmed stable voltage delivery under sustained CPU load with no mid-cycle cutoff.
After installation, run one full discharge to system hibernation cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false health warnings that appear after every cell swap.
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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

2200mAh

Acer Aspire One — 11.1V Li-ion Replacement Battery (UM08A73)

This 11.1V 2200mAh Li-ion battery replaces the original cell in the Acer Aspire One netbook series. It covers the A110-1295, A110-1545, A110-1691, and over 150 additional Aspire One variants. OEM part numbers UM08A73, UM08A72, UM08A74, UM08B73, and UM08B74 all cross to this cell.

  • Aspire One series coverage: These models share the same 11.1V three-cell Li-ion architecture, identical connector pinout, and the same BMS handshake protocol — which is why a single replacement cell spans the full A110 and A150 lineups without modification.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an Aspire One A150. The BMS communicated correctly with the BIOS from the first cycle — no unknown device flag, no charge refusal at initialization.
  • Post-swap calibration on the Aspire One: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. The Aspire One BIOS uses this cycle to recalibrate its battery learn table — skipping it causes the health indicator to show a false warning for weeks.

Aspire One shutting down at 20–30% shown on the fuel gauge

This is a voltage-cliff failure, not a capacity failure. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC can track — the BIOS triggers a hard shutdown before the displayed percentage reaches zero. It typically happens in the first two cycles with a fresh cell because the gauge IC has not yet mapped the new cell's discharge curve. Running two full discharge-to-hibernate cycles corrects the mapping. After calibration, the shutdown threshold should align with 5% or lower on the gauge.

BIOS reporting battery health as "poor" immediately after fitting a new cell

The Aspire One BIOS stores battery health data in EEPROM and compares it against the previous cell's logged wear state. When a new cell goes in, the EEPROM data no longer matches the fresh chemistry — the BIOS flags this as degraded rather than new. This is not a fault with the replacement cell. Run the battery learn cycle: discharge fully to auto-hibernate, then charge uninterrupted to 100% twice. The BIOS rewrites its health baseline after the second completed cycle and clears the warning.

Compatible Models

Aspire One Aspire One A110-1295 Aspire One A110-1545 Aspire One A110-1691 Aspire One A110-1698 Aspire One A110-1722 Aspire One A110-1812 Aspire One A110-1831 Aspire One A110-1948 Aspire One A110-1955 Aspire One A110-AB Aspire One A110-Ac Aspire One A110-AGb Aspire One A110-Aw Aspire One A110-Agc Aspire One A110-Bb Aspire One A110-BGb Aspire One A110-BGw Aspire One A110-Bw Aspire One A110L Aspire One A110L blau Aspire One A110L weiss Aspire One A110-Bc Aspire One A110X Aspire One A110X Black Edition Aspire One A150-1006 Aspire One A150-1049 Aspire One A150-1126 Aspire One A150-1249 Aspire One A150-1382 Aspire One A150-1447 Aspire One A150-1493 Aspire One A150-1532 Aspire One A150-1570 Aspire One A150-1672 Aspire One A150-1890 Aspire One A150-1983 Aspire One A150-Ab Aspire One A150-Ac Aspire One A150-Bc Aspire One A150-Aw Aspire One A150-Bb Aspire One A150-Bb1 Aspire One A150-BGc Aspire One A150L Aspire One A150-BGb Aspire One A150-BGw Aspire One A150-Bk1 Aspire One A150-Bw Aspire One A150-Bw1 Aspire One A150L blau Aspire One A150L weiss Aspire One A150X blau Aspire One A150X weiss Aspire One A150-Bk r Aspire One A150X Aspire One AOA110-1137 Aspire One AOA110-1283 Aspire One AOA110-1295 Aspire One AOA110-1588 Aspire One AOA110-1626 Aspire One AOA110-1722 Aspire One AOA110-1831 Aspire One AOA110-1834 Aspire One AOA110-1982 Aspire One AOA150-Ab Aspire One AOA150-1001 Aspire One AOA150-1029 Aspire One AOA150-1049 Aspire One AOA150-1068 Aspire One AOA150-1126 Aspire One AOA150-1140 Aspire One AOA150-1178 Aspire One AOA150-1359 Aspire One AOA150-1405 Aspire One AOA150-1435 Aspire One AOA150-1447 Aspire One AOA150-1505 Aspire One AOA150-1553 Aspire One AOA150-1555 Aspire One AOA150-1570 Aspire One AOA150-1577 Aspire One AOA150-1635 Aspire One AOA150-1649 Aspire One AOA150-1672 Aspire One AOA150-1690 Aspire One AOA150-1706 Aspire One AOA150-1777 Aspire One AOA150-1784 Aspire One AOA150-1786 Aspire One AOA150-1840 Aspire One AOA150-1887 Aspire One AOA150-1905 Aspire One AOA110-1995 Aspire One D150-1044 Aspire One D150-1125 Aspire One D150-1165 Aspire One D150-1186 Aspire One D150-1197 Aspire One D150-1322 Aspire One D150-1462 Aspire One D150-1577 Aspire One D150-1587 Aspire One D150-1606 Aspire One D150-1647 Aspire One D150-1669 Aspire One D150-1739 Aspire One D150-1860 Aspire One D150-1920 Aspire One D150-1B Aspire One D150-1Bk Aspire One D150-1Br Aspire One AOD150-1739 Aspire One AOD150-1462 Aspire One AOD150-1322 Aspire One AOD150-1860 Aspire One AOD150-1669 Aspire One AOD150-1165 Aspire One AOD150-1577 Aspire One AOD150-1920 Aspire One AOD150-1186 Aspire One AOD150-1125 Aspire One AOD150-1647 Aspire One AOD150-1606 Aspire One AOD150-1240 Aspire One AOD150-1044 Aspire One AOD150-1197 Aspire One AOD150-1587 Aspire One AOD250-1026 Aspire One AOD250-1042 Aspire One AOD250-1116 Aspire One AOD250-1132 Aspire One AOD250-1151 Aspire One AOD250-1165 Aspire One AOD250-1185 Aspire One AOD250-1196 Aspire One AOD250-1289 Aspire One AOD250-1326 Aspire One AOD250-1580 Aspire One AOD250-1610 Aspire One AOD250-1706 Aspire One AOD250-1738 Aspire One AOD250-1797 Aspire One AOD250-1905 Aspire One AOD250-1924 Aspire One AOD250-1990 Aspire One AOD250-1Bb Aspire One AOD250-1Br Aspire One 531H Aspire One AO531H Aspire One 531H-1440 Aspire One 531H-1766 Aspire One P531H-1194 Aspire One P531H-1791 Aspire One P531H-1Bk Aspire One 571

Replaces Part Numbers

UM08A73 BT00307005826024212500 UM08A72 UM08A74 M08B74 AR5BXB63 PPD-AR5BXB63 4104A-AR58XB63 2006DJ2341 RCPATAR06-784 C-5448 UM08A31 UM08A71 LC.BTP00.017 UM08A51 UM08B31 UM08B71 UM08B72 UM08B73 UM08B74 LC.BTP00.018 934T2780F UM08B51 UM08B52

Technical Specifications

Voltage11.1V
Amp Hours2200mAh
Capacity2200mAh
Rate24.42Wh
Net Weight162.3g /5.72 oz
Gross Weight312.3g /11.02 oz
Approximate Weight312.3g /11.02 oz
Dimension 203.00 x 31.00 x 22.80mm

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 One shows the battery Wh rating as wrong in system info after swapping the cell — is the battery faulty?

The Wh figure in system info reads from EEPROM data written by the original cell, not from live measurement of the new one. The replacement cell is rated at 24.42Wh, but the stored EEPROM value from the old battery may show a different number until the BIOS recalibrates. Run two full discharge-to-hibernate-then-charge-to-100% cycles. After the second cycle, the BIOS overwrites the EEPROM baseline and the reported Wh figure will reflect the new cell.

The Aspire One fuel gauge jumps around wildly — shows 80%, then 45%, then 70% within minutes of unplugging.

The fuel gauge IC on the Aspire One calibrates against the actual discharge curve of the installed cell. A replacement cell has different internal resistance and capacity characteristics from the worn cell it replaced, so the IC's stored curve is wrong until it learns the new one. This produces erratic percentage readings for the first two to three cycles. Let the battery discharge fully to auto-hibernate each time and charge uninterrupted to 100% — the gauge stabilises once the IC has mapped at least two complete discharge cycles against the new cell.

New battery installed but the Aspire One won't charge above 80% — stuck there no matter how long it stays plugged in.

Some Aspire One BIOS versions include a charge-limit setting that caps charging at 80% to reduce cell wear — this is a firmware-controlled threshold, not a fault in the replacement cell. Check the BIOS under Power Management for a battery care or charge limit option and disable it. If no such setting appears, reset the BIOS to defaults, then attempt a full charge again. The battery itself is not limiting the charge — confirm by checking that the BIOS charge-limit feature is off before concluding there is a cell fault.

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