Paperwork, and a willingness to be pinned down. All three bikes below state UL 2849 for the system and UL 2271 for the battery, name UL 2580 cells, and claim ISO 4210 for the frame. Across the rest of this site exactly one listing — VTUVIA's SF20H — states both UL numbers, and none names the cell standard or ISO 4210 as well. If your building, your insurer or your own caution wants a certification named rather than implied, this is the shortest way to it.
The second thing is unusual enough to be worth naming on its own. Every Velotric range figure carries a footnote: a 187-lb rider, PAS 1, flat roads. Nobody else on this site states the conditions behind a range claim at all. It does not make the numbers conservative — 70 miles from 352.8Wh is still a very light draw — but it turns a marketing figure into something you can check the arithmetic on, which is the whole business of this site.
Two of the three are cadence-sensor bikes, and they are the expensive two. A cadence sensor knows only whether the pedals are turning; a torque sensor knows how hard. At $1,899 and $2,199 that is a real omission, because several bikes on this site under $1,600 use torque sensors. Velotric's own T1 ST Plus, the cheapest of the three, is the one that has one.
Velotric also publishes less than you might expect given how carefully they document certification: no peak motor output for the Nomad or the Packer, no charge time for any of the three, no rotor size or piston count for the Nomad's brakes, and no rider-height range for the Packer — which is the model where a fit range matters most, since it is a cargo frame you may be lifting a passenger onto.
The Packer 1's certification is stated in the product page copy rather than in the specification table. It is the same wording Velotric uses for the other two models, and we report it as published rather than treating the table's silence as a contradiction.
Velotric publishes more images than any other brand here, and several of the files named "lifestyle" are advertising graphics with range and weight claims printed into the pixels. Those are not used on this site — republishing a merchant's marketing copy as though it were our own photography is the one thing this site exists not to do. The Nomad 1 Plus's remaining location shots show a yellow bike, and yellow is not a colour Velotric sells for that model, so those are not used either. It is why the Nomad's gallery here is studio photography only.