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So I want to replace my iPhone 6’s battery which is completely discharged so can the battery combust if punctured or cut by mistake?

Hi Yes a battery can combust if it is fully discharged but it isn’t as dangerous if it is I wouldn’t let this bother you though because as long as you are using plastic tools it’s very hard todo so Thanks

Yes, it can burst in any situation even discharge. Battery blasts when it got a chemical reaction between both the terminal and diode panel. Positive(+) and negative(-) points meet and create a short circuit.