I ordered a replacement battery for my wife's iPhone. They sent the wrong one. Requested a refund, they'll refund the money when they get the battery back, plus £5 for the shipping. Which is fair enough except sending a lithium-ion battery back to them isn't easy. Royal Mail won't do it, most couriers won't either and Amazon won't allow batteries to be returned via their lockers. So I've had to use UPS, and it's costing £8...