During the 2012 Earth Day celebration, lava shared ecotips on how to recycle used paper sheets, use of energy-saving bulbs, natural light, and rechargeable batteries.
These may be battery-powered, solar-powered, or "tree-rechargeable": able to recharge their battery systems using the small electrical currents in plant material.
Other portable rechargeable batteries include several sealed dry cell types, that are useful in applications such as mobile phones and laptop computers.
