Efest 1600mAh 30A vs Sony VTC4 2100mAh 30A - YouTube This guy did one, they are nearly neck and neck with the vtc4 just barely ahead by an average of about .2 volts. Pretty identical, but this isn't really that thorough of a test, you need watt/time curves to really get an idea.
-Then again, there is a reason why sony is so successfuljk
That's a comparison between the vtc4 and the old red Efest, not the new purple ones
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