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The Zilu Smart uses standard 18650 high capacity batteries inside of its closure. So for those that want to be able to have a long lasting charger and not have to worry about throwing it out when the batteries inside die this is a good choice as replacements can be easily found at most places rechargeable batteries are sold. See More
There are other portable chargers that use smaller and more powerful batteries, which allows the casing to be smaller and weigh less as well. The Zilu sadly is a bit heavier than most, but that seems to be at the cost of using 18650 batteries, which can be easily replaced compared to non replaceable smaller options. See More