Start your old mobile without battery
I think most of us have one or a few old mobiles which may lie in a corner without being touched for a long time. Most of those mobiles can still work but their batteries may be dead. Some of the mobiles can be turned on without batteries but some can not especially for those smart phones. Because they will check for a valid battery before properly start up. I found an old HUAWEI PLK-AL10 from my drawer and wanted to transform it into an alarm clock. But the problem was the battery had been completely dead. I had to do some modifications to fake a batter signal to make the board believe there is a healthy battery there and rely on the micro-usb power to start up. I took the mobile apart and got the battery with which I used a multimeter to test all the pads of its connector. Here is the definition of each pad. To fake battery signal I need at least two things: 1. Add a 10K resistor between temperature sensor pad and '-' pad. Or I take apart the battery and get the protec...