Got mine from gearbest. Can't go wrong. Only thing is that if you try to supply power to it via a computer usb port you will get terrible interference when the battery is fully charged. You can keep it powered by plugging it into a 5 amp usb wall charger to solve the problem.
FaszerI don't think so. It's a lipo battery. Lipos don't like to be fully discharged, that is what's most damaging. So leaving it plugged in shouldn't do any harm.