My charger took weeks to arrive, then blew up as soon as I plugged it in. When I emailed the laughingly entitled 'customer service' I was told that there was a problem with my electricity supply.
I've since bought another battery (making sure that this one is coming from the UK) and it works perfectly, of course.
I've no hope of a refund from these people, but I hope I can dissuade anybody else from giving money to them.