Battery dies then back to normal

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http://forum.xda-developers.com – I have an issue with my battery. Sometimes it starts to drain the battery VERY fast, like 80% in 20 minutes, then the battery dies and the phone turns off. But if I turn it on it starts with the ammount of battery it was before the crazy descharging, and the phone works as usual. It is a pain in the ass because every night it happens, so I cannot set an alarm. Sometimes it happens in the day too. (HowTos)