I use 1 canon battery that came with by 10D (so its about 2 years old) and all the rest are after market batteries for which I paid $11.95 each. They are 1800 mAh. They work just fine, except they last too long so I don't get as many opportunities to change batteries, which I miss. Since the Canon batteries have less mAh and cost 3 to 5 times as much, its a no brainer as to which to buy. They have different designations for what is essentially the same battery, bp511, 12, 11a, etc.
Cheers,
rfs
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