Hi, My name is ***** ***** certified computer professional with over 10 years experience. I will be glad to assist you with this. .I am sorry to hear that you are having this issue. The reason that the battery will no longer charge is that when it gets to zero charge the Blackberry senses that and thinks the battery is faulty.
Unfortunately the only way to get the phone wording again will be to charge the battery externally ot you will need to purchase a new battery..