New in box batteries leaking

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I cannot confirm the results of Eneloop rechargables shown in one of these videos. I have an armada of them in use (70+, AA + AAA, white and black), some of them 5+ years old. A small number of them (1 or 2 can't remember) has failed completely, but I do not see notable degradation in the rest. They still have the advertised capacity or more. Sometimes, every 3 or 4 months, I discharge and recharge the whole lot completely. They self-discharge very slowly, even after months in the box they can be used. I think it is most important to use a charger that has single battery monitoring.