Support battery discharging before completely charged

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http://androidforums.com – my phone's battery discharges before it is finished charging. i tried different outlets. i switched to a replacement battery. the phone worked fine after encountering this nonsense early on, but now several months later both batteries are malfunctioning again. first one began this backward action and, after switching batteries, a few weeks later the 2nd one started doing the same thing. why? (General)