Hello. This is an issue that happens to me for the second time and I cannot for the life if me figure out what is going on. A year ago I had a Blackberry Pearl, and I travelled to the US with it. It worked fine there, but once I came back, the battery stopped holding charge. It would last me a maximum of 6 hours if I didn't even touch the phone, less if used. Back then I tried replacing the battery, using a different charger, trying to use as few apps as possible...nothing helped. Eventually I decided my Berry was weird and bought an HTC One S. And then, 10 days ago, I went to the US. Phone worked fine there, but once I came home, the same damn thing started happening: battery lasts 5 hours, 9 on airplane mode, if I unlock the phone to read a text, it heats up and the charge drops from, say, 15% to, say, 9% in 30 seconds. I tried using different chargers. Nothing suspicious is consuming the charge if I check battery usage in the settings. It's driving me nuts. What is going on, and what - if anything - can I do to fix it?!