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The biggest 
 for fires starting are lithium-ion batteries. These can explode and start 
 if they are crushed or they get 
. The agency told the BBC that, "more people are putting 
 containing these batteries in with 
 waste". It said: "That causes a real 
 because they have a 
 - when damaged - to explode or ignite....They're likely to be crushed...or they might get wet.". It added: "They're in the 
 of other flammable material...that can lead to 
 big fires." We need to be mindful of the 
 hazards of batteries.