Czarmuzz, that sounds like garbage (no offense to you). First, if apple makes a claim that their battery pnly lasts two years, they need to document it. I doubt people will shell out hundreds of dollars for a products that are documented to only last two years. What they have is a design flaw flaw that they are calling a feature. Do you really think apple designed a phone to have a battery expand after twenty four months and ruin the device? Is that something Steve Jobs signed off on and said "Yes, lets sell this."
My device was purchased in August of 2009 and functioned perfectly until June when I got a 4S. After 34 months, the battery itself, still had remarkable capacity. The story in these cases seems to be the same, e.g. Bought a new phone, put the old one on the shelf for a couple of months, decide to use it for something else, charge for a little while, then boom... no more phone.
You do not see this happening in any other product they sell. This is a serious defect, they need to acknowledge it and offer to fix product or offer a refund to the consumer.
If you feel so inclined, write a reports on the US Consumer Safety site, saferproducts.gov. Other 3gs owners have started to write reports and document the saftey hazards of the battery suddenly exploding. Even if you don't live in the US, you can report the incident as Apple is a US company.
http://www.saferproducts.gov/Search/Result.aspx?dm=0&q=3GS&srt=0