Batteries contain corrosive materials and heavy metals that are dangerous for us and our nature (if the toxic materials in a battery leak into the soil it can even contaminate the ground water. Therefore it is crucial to recycle them. By placing a battery collector in your hostel you can help the guests recycle batteries while showing that your hostel cares about the planet.
An easy way to make a collector is to use an old can or bottle as shown in this photo from Natal Eco Hostel. Find out where in your local community you can discard them – often supermarkets. Learn more from this website.