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Explosions

When batteries explode: Here are five points you need to know

Samsung has told customers worldwide to stop using their Galaxy Note 7 smartphones after a spate of battery explosions threatens to derail the powerhouse global brand. It is the latest in a string of lithium-ion battery fires on products ranging from laptops to hoverboards to planes -- and a reminder that pushing the technology envelope can sometimes be problematic. Here are some things to know about Samsung's snowballing safety crisis, the handset recall and why batteries can be a fire hazard. How do these batteries work…