I have a fear of batteries leaking?

I have older electronics that I buy refurbished cuz they're cheaper then new ones and I'm worried the battery might be leaking in my iPad or phone and it gets on my hands so now I'm scared of touching my iPad or my phone cuz of this. They both are lithium ion batteries....do these type of batteries leak... show more I have older electronics that I buy refurbished cuz they're cheaper then new ones and I'm worried the battery might be leaking in my iPad or phone and it gets on my hands so now I'm scared of touching my iPad or my phone cuz of this. They both are lithium ion batteries....do these type of batteries leak when old or do they explode??? What are the signs they might be leaking? Please don't hate on me, I really am afraid of this and I'm a kid so helpful answers are appreciated. Also my electronics batteries hold charges fairly well and last a long time except for my phone which battery needs to charge a lot.
Update: Should I not use my iPad anymore? I really can't afford a new one and my iPad seems ok
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