I will not knowingly board an airliner with a 70 lbs Lithium Ion or polymer battery.
HENRA
So, how about a short range big selling jet that is supposed to have ring frames fabricated by CNC which were being produced by using hammers and mark one eyeball? Recall that the OEM's QA officers that reported this to the OEM were constructively dismissed, and about 20% of this fleet operate under the auspices of the leading FAA oops sorry, er, "NAA..."
as being fit for service? After you have removed all the aircraft types that have had issues in introduction... gong to be doing a lot of walking.
Now, OTOH, your concern on LI batteries has some merit. Personally, not too keen on them, blew the nose off a MIL jet I was flying once with a BTR, lots of metalwork and a new engine needed, so cannot say that I am a fan of these. ll systems have risks, time will tell.