I would not expect to see more than one battery on a single board. Just keep in mind that you may find a battery in a lot of other devices in addition to motherboards. Most batteries you find are the coin type, mounted flat or in a vertical position, likely what you've been pulling. On some occasions, you may find one that is wrapped, or encased in a rubbery plastic, you'll see a wire or metal tab slipped under the material that attaches to the face of it, or both faces if it is vertical.
I make it practice to scan for the battery as soon as I pull a board, get it done first, and then I double check before putting it to a shipping container. You are probably doing fine. If you are not sure of something, don't be afraid to post a picture. These guys around here are more than willing to help out.
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