By fake I mean 'non-genuine'. Anyone had any experience of these? Always nice to have a couple of charged spare batteries in the bag when going on all day shoots. Amazon want around £35 for a standard Canon battery. There are a lot of 'non-genuine' batteries on ebay for less than £10, has anyone had any experience of these? Normally you get what you pay for, but these wouldn't be my 'main' battery, just a back up. Opinions?