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| p.1 #15 · Generic batteries for Canon DSLR? |
I've worked in the PC Industry for about 20 years, most of that in the area of peripherals, which includes batteries, so I have some parallel experience here.
There is a bit of risk with the non-OEM batteries, but in the unlikely event that you have an issue that will cause damage it is almost always during charging, so the risk to your camera is fairly small (which isn't true for PC's - knockoffs can be a big issue there...).
More likely, you won't get the performance or longevity of the OEM battteries, but as backups you aren't worrying about that much.