Buy a new battery....... I got a Sony Battery from Ebay for around $20. I was shocked when it started working normally again. I did all those things, cleaning, etc. I couldn't imagine it was the battery but it was. P.S. make sure you take apart the long center filter. I was surprised that there were feather and other solid things, I still can't figure how they could have gotten in the center of what seems like a sold tube!!!!.