it should work with any fruit or any type of electolyte. it's like one of those potato clocks, there are 2 different kinds of metals in the usb connector so there is an electrical potential between them when they are immersed in and electrolyte solution. same way duracells work.
Some of us actually attended High School Science Class, instead of skipping class to perform other chemistry experiments in the alley behind the school.
I know this is a shock to you, but its true.:
In my situation, "..ear" was spoken much more than in anatomy class. Besides..we didn't have an ally..we had woods. Wintertime, we had Camelback. Either way I had enough credits to graduate and we fried up the potatoes.