Very highly charged. Since I couldn't squeeze them together, I could hardly put them on. The lower ball connector simply snaps into place. The tip has a small stem with a retaining ring. Since they have such great power, I started putting just one, but then changed my mind and put another. You'll need to hold on to the trunklid when opening it because if you go past the midpoint it will really come loose and will be quite stiff at the attachment points. One thing is for sure, the lid will not fall off even in strong winds!
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