I could be wrong, but I think that's one of those notorious "blue batteries" you see on ebay that lie about their capacity. Maybe some one else can weigh in and verify this.
don't buy it.
I ordered one, then luckily the order got cancelled after hailrazer told me it was crap. Keep in mind that lithium batteries come in multiples of 3.7 volts..... so a 12v is probably a scam.
If you find something that claims to have a large capacity for a ridiculously low price, avoid it.
The unfortunate truth of batteries is that you don't want to go cheap with them, quality is everything with batteries, you buy the cheap ones and they're crap. Don't try to save money on batteries, you'll regret it.