Can I charge a mobile phone battery without a charger?

a smartphone charging on a wireless charging station

Yes. Charging stations are pretty common nowadays. Most of these will contain the right connector for almost every popular smartphone. You can find them in most major train stations, coach stations and shopping centres, although you will have to pay to use them. Alternatively, some of the major food and drink chains like McDonalds and Starbucks are rolling out wireless power mat charging that’s free for their customers to use. Not all smartphones support this wireless charging yet so you’ll need to check with your manufacturer first.