Renting power banks at restaurants or stores used to be part of Timothy Chen’s routine whenever he was out and found his iPhone running out of juice.“I don’t want to carry a portable charger in my pocket every time I go out, especially when I can find a shared one almost everywhere and it costs only a few yuan each time,” the Shenzhen resident said.However, Chen’s appetite for it is has waned since the coronavirus pandemic: “I’m not too concerned about the hygiene problem when I used a shared…