Sorry you had a bad experience, many others, myself included, haven't had a bad experience.
When I ordered my Chinese battery from Ebay, due to the shortage of OEM batteries, I got a communication from the vendor saying sorry but their batteries would not charge in the Olympus charger, but did I want a free wall charger? So I said yes, they all arrived and work brilliantly. The battery life is every bit as good as the OEM battery, and the charge indicator works as normal, and the camera hasn't exploded.
Steve