It depends on your exact model, since the Acer Netbook line uses several non-interchangeable lithium-ion designs. The 10.1 inch D-series uses the UM08Axx family (for example UM08A71), the D255, D257, D260, and D270 use the AL10Axx family (such as AL10A31), and the 11.6 and 13.3 inch AO722 and AO756 use the AL12Axx family (AL12A32 or AL12B32). Packs come as 3-cell, 4-cell, or 6-cell at around 10.8 V or 11.1 V. Check the label on your current battery to confirm.

Start with the model number on the bottom of the laptop (for example AOD255 or AO722), then read the part number printed on the white battery label. That part number, which usually starts with UM, AL, or BT, is the most reliable match. A 10.1 inch D-series often shows a UM08Axx code like UM08A71, while a D255 shows an AL10Axx code such as AL10A31. Matching the printed part number, not just the screen size, ensures the pack fits and seats correctly.

Acer Netbook replacement batteries are priced at $55.99 in this category. The figure covers the lithium-ion packs across the D-series, the D255/D257/D260/D270 group, and the AO722/AO756 ultraportables. Because 3-cell and 6-cell versions can carry the same family code, confirm your exact part number (for example UM08A71 versus a 6-cell UM08A73) before ordering so you get the configuration that fits your bay.

No, not across sub-series. The UM08Axx, AL10Axx, and AL12Axx families use different physical designs and connectors, so a D-series UM08A71 will not fit a D255 that needs an AL10A31. Even within one family, a 6-cell pack extends from the bottom and props up the rear, while a 3-cell sits flush, so they look and seat differently. Always match the exact part number on your current battery rather than assuming two netbooks share a pack.

Cell count, voltage, and physical shape. The 10.1 inch D-series (UM08Axx, such as UM08A71) and the D255/D257/D260/D270 group (AL10Axx, such as AL10A31) use 3-cell or 6-cell packs around 10.8 V to 11.1 V that drop into a rear bay. The larger 11.6 and 13.3 inch AO722 and AO756 use the AL12Axx family (AL12A32, AL12B32) in flatter 4-cell or 6-cell packs that are often internal or flat-bottom, so those usually require opening the lower case.

On the white label of the battery itself. On 10.1 inch netbooks with a removable bottom pack, release the latch, slide the battery out, and read the code printed on it, for example UM08A71 or AL10A31. Codes typically begin with UM, AL, or BT. On the AO722 and AO756, where the pack can be internal or flat-bottom, you may need to open the lower case to see the label. You can also cross-check the model number on the bottom case of the laptop.

Usually yes on the 10.1 inch netbooks. The D-series and D255/D257/D260/D270 packs sit in a rear bay, so you release the latch, slide out the old pack, and seat the new one. Note that a 6-cell pack extends from the base and props up the keyboard, while a 3-cell (such as UM08A31) sits flush. The 11.6 and 13.3 inch AO722 and AO756 in the AL12Axx family are often internal or flat-bottom, so those require opening the lower case for the swap.

Short runtime is the clearest sign: a pack rated near 11.1 V that once ran for hours now drains in minutes. Other signs include the netbook shutting off without warning, the charge percentage jumping around, or the system only staying on while plugged in. If a 6-cell pack such as UM08A73 no longer holds a useful charge, it is time to replace it. Confirm your exact part number from the battery label before ordering a fresh pack in the same family.