Last night we were sent an interesting report about Tesla Roadsters falling into an unfortunate state -- a very terminal, very expensive state. According to theunderstatement a Tesla Roadster that is left to discharge completely, a process that could take many weeks, will need to have its entire battery pack replaced (pictured above) -- at a cost of approximately $40,000. There are said to be no countermeasures that can prevent this short of keeping your car topped up, and while that may sound simple enough, it becomes tricky if you need to put the thing in storage for a few months.While we haven't been able to confirm all the "several" supposed cases of this happening, we did hear back from Tesla issuing a statement (after the break) that more or less affirms this could happen. Tesla uses a number of so-called "countermeasures" to prevent this, up to and including a representative from the company calling the owner should a battery pack trail dangerously low. Worryingly, though, this situation is said to be possible in both the upcoming Model S sedan and Model X SUV. Here's to hoping for a little more clarity on this issue -- and maybe a solution -- before those two come to market.Autoblog Green takes a closer look at the origins of this story [Thanks to everyone who sent this in]