The battery in my jetpack has swollen up and won't let me put the back cover on. I went to the local Verizon Store and they said they could not help me that this is caused by leaving it charged for to long. We don't leave it charged for extended periods. It looks like it's going to explode. It's been swelling up for the last 6 months and finally it blew the cover off of it and I can't get it back on. How do I get a new battery?