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Out shooting some BIF today, and had the good ole ERR 99 on my 1D Mark II. It has been a year or so since I'd had the error, shooting often.
This time though, it was different.
Had a full battery (or 3/4 full) and happily shooting away. Then all of a sudden, took a shot, shutter stayed open, and the battery indicator was blinking on the top LCD.
Reseated the battery, turned it on, shutter released, fine. Took one more picture.
Took a second picture, and BAM, ERR 99.
Turned it off, reset the battery, took a shot, worked okay.
I continued to have the shutter issue though, with the low battery indicator. I've since been charging this, but it got me thinking about what could be causing this. I really feel that this is all battery related. I cleaned the contacts, and the battery seemed to work again for a brief time. I then put my OEM canon battery in, knowing it was fully charged, and it work fine.
Sooooo, not sure what the deal is, did some searching on other ERR 99 threads in here, but it seems nobody has nailed down what the specific issue is, because it could be one of many issues (or a combo). Could be generic battery (Delmar), contacts, or more. There is no corrosion in the battery compartment, so probably not that.
Anyway, just passing on my findings.