... ,mercury,etc.4.Non-metal LithiumLi-ion battery does not contain the metal lithium,much safer than the metal lithium battery.5.Long ... Lead Acid.5.Environmentally Friendly Non-toxic, non-contaminating, No rare metal, UL, CE, SGS/RoHS approved. Li-ion technology does not ... not exhibit the 'memory effect' of Nickel-Cadmium and Nickel-metal Hydride solutions.6.Another key benefit of our Li-ion ...