Battery weirdness

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http://forum.xda-developers.com – I've noticed lately that my battery has been draining pretty quickly, but I've since chalked that up to an old battery that just needs replacement. But I noticed today that my battery ran out and my phone shutdown, but I went to charge it and immediately turned it back on and noticed that it read 50% charged. What is happening here? Sent from my Dark Unicorn Resurrected v.2.5 using xda app-developers app (HowTos)