Generally, it's mandatory to remove batteries. I believe this due to one or more of the following. Toxicity, possible undesirable chemical reactions and/or laws on disposal. I have not found a buyer yet who has told me that removing the AL caps will upgrade a board. It would only hurt me in time spent and a little weight loss. The fact that most of these caps weigh very little is most likely why I'm told to leave them on. Their weight does not effect the buyers bottom line either. A scrap yard buyer is liable to tell you anything when it comes to this type of question. Most likely because they don't really know and want to be on the safe side. My opinion, YMMV.
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