Enormous 13,000 mAh EeePC battery
Asus' EeePC is the heart of netbooks. Cheap, small and offered in a mind-numbing confusion of slightly-different incarnations (19 different models in the U.S. alone), it also has the strongest aftermarket. This leads to strangeness.
Take, for example, this enormous 10-cell, 13 ampere-hour battery. It's massive. It's also inappropriate: it's designed for a completely different EeePC to the one used, and as a result sticks out sideways.
On the other hand, you get about 12 hours of battery life from it, which means you'll have plenty to spare on a daily charge, no matter what you do.
Meet the ugliest battery ever [jkkmobile]

the latest
latest episodes

for 12 hours running time, I can deal with ugly.
I can't even stay awake for 12 hours straight.
...ANd if you chain three of these together, you've got one heavy set of Nunchucks!