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I just bought a new Blackberry Q5 when I plug the charger in the yellow flash appears but insted of charging the battery drain.. I opened the back cover and removed the battery, swiched on the Q5 The battery from 0% came to 100% after 5minutes the battery drained to 0% again. Still won't charge. Any help please? Thank you.
The battery could be faulty. Although your phone may be "new" to you the q5 hasn't been produced in a couple of years and the battery may simply have discharged to the point of failure.
Make sure to charge with a proper wall charger rather than off of a USB port.
With the device plugged in are you able to power device on? If so use device monitor to check battery status and battery health.
If your problem persists you should consider replacing the battery or the device if you have any return or warranty policy available.
Posted via CB10