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    $\begingroup$ So something similar to how we treat propane bottles but in reverse, you can swap the bottles for free but people pay for the propane (magic), only the first bottle cost you any money and after that you get paid to exchange full bottles for empty ones. You should include some easy way to tell how charged they are. $\endgroup$
    – John
    Commented Jan 12, 2017 at 20:51