Just passed 2 years since I use my TT Adventurer and suddenly, like touch of magic rose, the battery work a half time than before. Quite surprising and sudden so I guess that it is not a battery life end but something else. Would you please advise what I should do? I read in forum that some solution is to do a downgrade and fix the battery issue but I have no idea how to do it. I will be grateful for any help/advice.