I have an Acer 5517 that I have no problems with since boought 4 years ago. The battery finally will barely hold a charge. I got a message the other day that I needed to replace the battery. I have bought two new batteries, nost refurbished etc. It will not charge them. When I put the old battery back in it charges. I took them to a computer tech, he says they are the right batteries and they are both good. He does not know why they will not charge. I contacted Acer authorized service center, they said they could not help me that I would have to contact Acer. I have scoured the internet to no avail. Sometimes it will say it is charging 7% then turns around and says not charging. Suggestions?