Yes, they most definitely can guarantee safety. These phones (rather, the batteries) don't just explode on their own. There are numerous safeties in place to prevent a battery from shorting when used properly.
More likely than not the man was using a fake/counterfeit battery to save a few bucks, or he spilled something into his phone and never bothered to worry about it. Over time, a spill can result in a short circuit (due to the formation of dendrites) in the battery, which leads to the eventual explosion - or more typically, a qui... (
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