as is the screen and just about everything else in it. If you mean "can I snap off the battery cover and pop in some AA cells" well then no. But batteries and most everything else in a iPhone (or an iPad, iPod, Powerbook, or anything else) can be had from at least a dozen vendors including videos and step by step instructions to accomplish it.

The same can be said for other consumer electronics. The wife dropped her Panasonic point-and-shoot in Nova Scotia and shattered the LCD screen. Panasonic said they would be happy to fix it for a flat fee of $200. A new one costs about $275. A quick search on ebay turned up 5 or 6 vendors for the screen. I bought one for $25, replaced it using one of the many YouTube video instructions, it works like new for $25 and 1/2 hours time (the guy on YouTube did it in a single take of just over 4 minutes).

But it remains to be seen if Apple will be the same under Tim Cook. It has been a different company under various CEOs (I was there for a lot of them).