Popular Mechanics (South Africa) - - Recycling -

Old cell­phone bat­ter­ies were big and bulky, forc­ing many early-ver­sion mo­bile de­vices to take on their col­lo­quial brick-like shape. Ni­cad bat­ter­ies are recharge­able, which was a rev­e­la­tion in the early 1990s, but they suf­fered from mem­ory ef­fect, which re­duced their use­ful­ness over time with every sub­se­quent charge and dis­charge. It’s from these bat­ter­ies that the ur­ban myth of hav­ing to charge your smart­phone up to 100% and then only recharge it again once it gets down to 0% con­tin­ues to prop­a­gate. Modern lithium-ion poly­mer bat­ter­ies do not suf­fer from mem­ory ef­fect, and ac­tu­ally en­joy a pro­longed life span if they are charged in short spurts be­tween 20% and 80%, never be­ing al­lowed to reach full- or zero ca­pac­ity.

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