Our increasing use of smartphones, tablets and laptops while traveling implies a constant quest for a power outlet to charge them. Hotels, on the other hand, try to minimize their electricity bill by using a key card holder, so the electricity switches off when you’re not there. As a result, hotel guests are not able to charge batteries while out-and-about. There is a clever way around it, however. Refrigerators do not switch off, as it would make them useless. Just use that outlet for charging, while you’re not there. It may require some fidgeting or even a splitter, but I guarantee it works.