HTC One-S owner here….no need to swap batteries as the battery lasts for a full working day with no need for a top up charge.
Mine comes off charge as 6am when i leave for work and gets hammered all day, i have twitter and facebook feed/notifications on all day, sometimes use GPS/Sat-Nav, listen to music on Youtube, have push email enabled, send some texts, browse the forum, make some calls and get home at 8pm with around 30% left….the other day when i was busy at work and didnt use it much i didnt charge it when i got home and was curious to see how long it would last on lighter use…got to 28hrs with 10% battery left….not bad at all….considerably better than the Samsung Nexus-S i had beforehand.
The reason is the chip, i mentioned this in another thread….the Qualcomm S4 in the One-S is about the best processor available in the world right now and there is a worldwide shortage because of this….its built on a 28nm processes whereas the One-X and Galaxy S3 are 40nm and 32 nm respectively….the lower the number the more efficient the chipset….smoother operation, better battery use, less heat etc….
I have the black one with the metal unibody design and Gorilla Glass screen, its impossibly thin and far more sturdy that the plastic Nexus i had before….gorgeous phone, i’m hoping that quad core processors and ridiculously large screens are a passing fad and manufacturers go back to building clean, efficient phones instead of willing waving about core count….its like the nonsense with the megapixels war a few years ago….thankfully that has now calmed down with most phones having between 8-12 megapixel cameras.