Not sure which eBay one you bought, but I haven't had any trouble with the Aputure one and I hear others here have similar good experience. I've had mine for, I dunno, couple of years. Only just replaced the original battery a week or 2 ago. I had left it in all that time, the LCD screen always on. Obviously doesn't chew much power. I've decided to take the battery out when not in use this time, see how long it lasts.
I wonder if the "new" battery you bought has been on the shelf a while?
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