They may hold a charge. It is not usualy dangerous unless you grab each
lead with each hand so the currrent passse through your heart area, but it
sure can make you hirt yourself. Take a screwdriver with a plastic handle
and short across the leads or terminals of the capacitor you are taking out.
The new one will not have a charge on it, just the old one that has been
plugged in may have a charge, but probalby will not especially if it has
been off for a few days.
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