Small engines, small batteries, little reserve
A microvan such as the Freedom or Beidouxing has a compact engine bay and a battery sized to match, often smaller than the one in an ordinary saloon. That leaves little spare capacity. Park it in summer sun, run the fan on high during a delivery round, and the margin between a good start and a click disappears quickly. We fit the size the tray and clamp were built for, and suggest a higher-capacity version only when it genuinely fits the same footprint.
