The chargers have about 1.25 inches of space below them, and about 0.75 inches separating them. You are right! I have been thinking about cooling issues. They were getting hotter last week before I gave them a bit more breathing room. Once I even ran a fan in the car to keep them really cool while charging. I think I'll invest in a 12v fan that keeps the air circulating while they charge.
I sort of want them to break so I can invest in a superfast charger that's tons of money that I don't have.
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