I think it’s reasonable to expect users of self-assembled drone batteries to be aware of and careful about those batteries. These batteries are intended for RC hobbyists, and are likely to be subjected to physical abuse. I’m talking about the battery packs covered in thin plastic wrap with no integrated protection circuitry, like this: http://www.rapidrcmodels.com/turnigy-5000mah-2s-20c-lipo-pac...

But batteries in consumer products, like laptops and ready-to-fly drones, should be protected both physically (with a harder plastic case) and with integrated charging circuitry. That seems to be the case with consumer drone batteries, like the DJI Phantom: https://m.dji.com/product/phantom-3-intelligent-flight-batte...