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The Asus UL20A is a 12.1 inch notebook with an Intel CULV processor and integrated graphics. It ships with a 47Whr, 4400mAh battery.

The Asus Eee PC 1201N is a 12.1 inch notebook with an Intel Atom 330 dual core CPU and NVIDIA ION graphics. It ships with a 63Whr, 5600mAh battery.

Here’s what I discovered today: Those two batteries are interchangeable. That means if you can get your hands on an Eee PC 1201N battery, you can use it in the Asus UL20A, which is great news for UL20A users.

When I reviewed the UL20A, one of my only complaints with this little laptop is that you don’t get the same kind of 10-hour battery life with it that you get out of the larger, more expensive Asus UL30A. That’s largely because the UL20A comes with a lower capacity battery.Taking an Eee PC 1201N battery and throwing it in a UL20A might help you get closer.

The UL30A that I tested had an 84Whr, 5600mAh battery. So slapping a 63Whr battery in an Asus UL20A probably still won’t give you 10 hours of run time. But it should help you get more than the 6 or so hours that I got in my tests.

I’ve found a few stores that are selling the 63Whr version of the Eee PC 1201N/UL20A battery, including one US site and two UK sites. I haven’t dealt with any of these retailers before, so order at your own risk. It looks like both the 63Whr and 47Whr versions of the battery have the same model number: Asus A32-UL20. If you spot a better way to tell them apart, let us kno win the comments. Prices seem to be ranging from about $72 US to £78 in the UK right now.

I should probably point out that while the two batteries look identical from the bottom (they both have a matte black surface that matches the base of both notebooks), the Asus Eee PC 1201N battery has a glossy section meant to match the glossy back and lid of that laptop while the Asus UL20A battery has a matte finish all around. If you’re a stickler for consistency, this could be a problem. But if you just want to improve the battery life on your UL20A, this seems like a small price to pay.