@Hummie, attaching any part of the Drive elsewhere to the board excludes the use of any deck with the slightest flex. So we went with uniquely the truck holes and strengthened the entire structure accordingly.
Thanks @Maxid. @Spencermiller: the battery is indeed plastic, covered by the blue TPE over half its surface. The rest of the Drive is a magnesium alloy painted black. The TPE is positioned to cushions any contact between the battery’s plastic case (when seated) and the metal housing, to stop transmission of shocks and vibration between the two and keep the fit tight.
A few corrections on your comment: The plastic is not ABS but PC/ABS: an alloy of Polycarbonate and ABS. ABS alone is actually quite flammable. The combination of heat resistance (PC) and impact/mechanical resistance even at low temps (ABS) wouldn’t prevent its use in plumbing, but might be seen as overkill. Its usual applications are in PCs, TVs, mobile devices and most of the plastic in your car.
We’re open to feasible suggestions on how to reassure you our specs are what we say. The presence of a $40 RoPD connector is perhaps salient enough proof to show we wouldn’t skimp on a few dollars of plastic. (Compare with $0.20 Chinese magnetic connectors on Alibaba.)
We welcome independent testing (at one’s own liability, especially for destructive testing). 5VA (thickness is 3mm if you are looking at the pdf) is the highest level of flame retardancy rating possible and thus easily verifiable.