breitling emergency

[lurch]

hello, ive been offered a titanium breitling emergency for £450 pounds

its definatly genuine, but the watch doesnt tick and the lcd display isnt on, i asked him why he was willing to let it go so cheap and he told me the battery is flat and it costs quite a bit to replace it

there are no papers or the case with the watch

after doing some research it does seem that the story about the battery being replaced is true as after the first free one with the warrenty the battery replacements cost a lot of money.

so i was just wondering what is involved in the battery changing process to make it cost so much, is it something complex, why cant i do it myself rather than pay breitling $600?

is it something to do with the inbuilt destress signal? are the batteries a rare expensive type exclusive to breitling?

cos to me it just looks like 4 simple scews to have the case of and then pop a normal battery in there.