I want to do a train and ride this fall but "Amtrak accepts electric bikes and scooters powered by lithium-ion batteries and certified by a nationally recognized testing laboratory". My Yamaha batteries aren't UL certified nor are the batteries for my Qiroll or Tongsheng kits. Ryobi and Greenworks power tool batteries also don't mention UL certification. Anyone aware of UL 2271 certified aftermarket battery source(s)? I did ride Amtrak several years ago and left bear spray and camp stove fuel out of my backpack because they weren't supposed to be allowed but I was never questioned if I had them with me. Still, I don't want to take a chance bringing a non-UL certified battery with me on a train.