Problem: is it safe to keep recharger of device (ordinary/smartphone) plugged into socket when electricity goes out?
Solution: It always may not be safe to keep your device (ordinary/smartphone) plugged into socket when electricity goes out. Your device/its battery may get damaged when electricity comes back with abrupt fluctuations/voltage. It's safer to unplug your recharger after electricity goes out. Plug it into socket again after electricity comes back.
