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My Motorola xt 1575 wont turn on after battery replaced but LED light turned on when I plugged into charger and I can get bootloader mode when it plugged on to the charger charger unplugged device turned off PLEASE HELP ME TO FIX THIS please tell me to this is battery problem or motherboard problem

If the device turns off right after unplugging it from the charger it indicates that the battery is faulty or it is not connected correctly.