By recycling IT equipment you can help both local and international charities depending on your choice, a great way of getting free promotion. There are many companies out there that can help you get rid of your IT equipment in an environmentally friendly way, some even offer their services for free.
Recycle the printer cartridges. There are several companies that collect your empty cartridges for free.
Batteries
Buy a battery charger as you will save lots of money and energy when you charge your batteries instead of buying new ones.
Batteries are hazardous for the environment and should always be recycled.
Remember to disconnect the charger (both battery and mobile phone battery) when not in use as it continues to use energy even when charging is completed.