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Basically, every rechargeable battery has elements in it like Lithium, Cadmium, etc. which are highly reactive when they come in contact with air or moisture - they even blaze or burst. That's the reason the batteries are sealed so hard and with multiple layers of membranes. But these layers (plastic and/or metal) are heat resistant to a certain extent.

When put on charger, you would have noticed that there is much heat generated. Further, when there is a call, some mobile phones generate heat due to the strong signals they receive - added together, enough to melt the cover or expose the explosive material inside to air/moisture. That's the reason why there are so many cases of mobile batteries bursting when attending calls while being charged.

Hope that helps...

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Q: Why does a mobile battery burst on exessive charging?
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