IPhone  3G = Yahoo Messenger drains battery even while being plugged in

Yesterday, I was on Yahoo Messenger. My battery went to 20%. I plugged it int, and stayed on Yahoo. the Iphone 3G still drained the battery completely and shut off. Is this norma;? Can't the charger over power the system draining?

Some apps, especially when requiring constant Internet access require a lot of battery power as they keep the 3G/WiFi radios active constantly. Especially on older models, this will be much more noticeable.
If you aren't already, try charging from the mains adapter (USB ports can't supply as much power, so using more power than it can provide will drain the battery).

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