Surely if the lipo is in a bag and the bag hasn't split/opened then the sand has no direct access to the lipo to stop the fire, it will only cover the bag and stop oxygen being available to the fire. Their will still be some oxygen trapped inside and should self extinguish?
The same applies to a metal tin, the sand won't cover the lipo only the container therefore stopping oxygen getting to the fire. The big advantage with the metal tin is it won't split open and start spitting hot fragments of a barbecued lipo at everything in close proximity.
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