Blackberry Bold 9900 *QUICK SALE NEEDED* ?

I have a used but in very good condition Blackberry Bold 9900, only phone and battery no accessories included. The reason for the cheap price is that the phone does not turn on, the red light at the top keeps blinking and when connected to a charger a battery sign with a red cross is displayed on the screen. it may just be a faulty battery or perhaps something else but i do not have time to get it fixed and so selling it. i am sure that the problem is 100% fixable. Cash on collection only. thanks!