I am looking for a portable (battery operated) receipt printer for an android tablet

[ebutticci]

I am looking for a portable (battery operated) receipt printer for an android tablet

[VanKalkerFarms]

You'll find a list of compatible printers for Android devices here: https://squareup.com/help/us/en/article/5509-supported-hardware-for-android-devices

Unfortunately, I don't believe any of them will be what you're looking for.