If you have a MacBook Air A1466 model, the battery compatibility depends more on the specific battery part number rather than just matching the A1466 model number.
Here are a few tips on getting the right replacement battery:
* Look up the full part number for the original battery in your A1466 MacBook Air (usually found on the battery sticker or in system information).
* Find a replacement battery with the identical full part number to ensure compatibility. Matching just A1466 alone is not sufficient.
* If an exact part number match isn't available, look for a battery with the same voltage (11.3V), watt hours (3800mAh or higher) and dimensions.
* Avoid any batteries intended for different MacBook Air models, as the fit and connections may be incompatible, even if they have A1466 in the description.
* Reputable sites like iFixit have battery replacement guides showing exactly which parts work for each A1466 MacBook Air. Check the guides to buy the right match.
* Be very wary of cheap no-name batteries which likely won't have proper board connections. Stick to genuine Apple or reputable third-party replacement batteries.
The most important factor is finding the battery with the identical full part number as your original. Matching just the A1466 model year alone doesn't guarantee compatibility.