Not the mods, Wolf, the charger.
Some have pretty strong springs on the sliding contact, and they can snap back when you remove the battery. While sharp edges there would make it more likely, since it's the edge of the slide even if chamfered it could still cause damage.
Hold the bottom tab as Im taking a battery out , as yes it does spring back fast.
Looked at my batteries and I think skin would cut easier than the battery , at least a tear to worry the battery.