Bluetooth headsets

[Broncho]

Not sure if this is the place to post this so mods please move accordingly if I put it in the wrong spot. I got a Diamond about two months ago and it is the first phone I've had with Bluetooth on it and I'm thinking about getting a headset for it. The thing is, I only use a headset in my car so I would leave the Bluetooth headset in my truck just like I do with my current wired set. I'm in the Dallas area so it can get real hot in vehicles, and it has been known to get cold too. I was wondering if other people treat their headsets similarly and if it can cause problems or age the headset (and battery) pre-maturely. The last thing I want to do is spend $30 to $100 on a headset and have it die on me in the first month or two because of the conditions it is stored in. I would appreciate any adivce anyone has.