Lithium-ion batteries contain elements that could pose a health risk to individuals if allowed to seep into the groundwater supply. In some countries, it may be illegal to dispose of these batteries as standard household waste. Fortunately, many recycling facilities exist that process lithium-ion batteries, in part because of the value of the materials contained in individual batteries. In the US and Canada, a large network of over 30,000 battery recycling sites can be found at www.call2recycle.org.
To keep the battery safe, tape any exposed connectors to prevent accidental shorting of the battery's positive and negative terminals during shipping. Put each battery in its own plastic bag, seal the bag, and place the battery in the recycling container. Do not dispose of batteries in fire or incinerators as batteries may catch fire and explode.