Cramer's lightning round: 'I'm not going to fight you if you like Nio'

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

Crown Castle: "People are upset that this thing hasn't just soared higher. I say, give it a little time. C'mon, these stocks have been great for a long time and [Elliott Management]'s in there, I'm saying buy it."

SolarEdge Technologies: "If you've taken off your initial investment and you're playing with house's money, no, you keep running it. All the solar stocks are going nuts, and what can I say, they've got a bunch of new ones, too. First Solar's high. But people love solar. It's gotten economic."

Sunrun: "It's going higher. Blackstone, they offered the stock $61, $62. It's going to be a buy. I hate recommending stocks because they're hot. The sun's hot. They're hot. But they're working."

Nio: "Oh my god, Nio. OK, so Nio was down ... it's been a straight line up. Nio is the Tesla of China. I've been recommending Alibaba, that's been my Chinese play. But I recognize Nio has been a hot one. I'm not going to stick my neck out, but I'm not going to fight you if you like Nio."

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