There are numerous threads about the battery life of the Desire and almost all are filled with anecdotes, arguments and claims of insanely poor or insanely good battery life. Here are some tips on how, as a new user, one can maximize the life of a single charge on HTC Desire. 1) Make sure the battery is charged to 100%. This may seem obvious (the LED is green so it must be fully charged, right?) but new users may be unaware of the way the battery charges. You can check charge exactly by "dialing" *#*#4636#*#* to open the Testing menu. From here hit Battery information and it'll give you a precise measurement of the charge (the graphic icon in the status bar tends to round up the measurement giving a slightly skewed indication of the charge. It may for example register 100% but the Battery information reveals the charge to be only 93%. 2) Switch off Background data and Always on mobile data if you don't need them. Background data is found in Settings>Accounts & sync. Always on mobile data is found in Settings>Wireless & networks> Mobile networks. 3)Put wifi and bluetooth widgets on your homescreen. Both are found in the Add widget>Settings (drop down menu). You can switch these on and off at the touch of a button giving you precise, manual control over these battery draining features 4)Do not use widgets that require regular synchronization. It's struck me as quite bizarre as to why anyone would need a widget to tell them the weather (I mean, what on earth did they do before - call the met office every 15 minutes?) but hey, if that's what you want it's going to drain the battery. 5)DO NOT INSTALL A TASK KILLER if you are new to Android, trust me on this - they are utterly pointless with 2.1 and 2.2. They drain your battery and slow Android down. This is not subjective opinion. It's fact. 6)Do not let your battery fully drain to zero charge. Li ion batteries do not "like" being fully drained. They "like" to be topped up. This may be news to older phone users but hey, technology changes. I should say thanks to the many users who have mentioned these things many times in many threads (danfrance, lekky, riki1kenobi to name but three) and I'm not trying to take credit for any of the tips.