Trappy explains: "the battery bay is there to make your ZII durable. on our tests we dived in vertical from 30 meters on purpose. the forces get spread evenly and the 6mm plywood takes most of the beating, protecting the battery and the ZII. Use lots of gorilla glue when glueing it in, the glue will enter through all these tiny holes in the ZII Bay and make it really strong."
Product page
here, forum discussion
here. Lots of detail from Trappy, be sure and check it out!
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