this was while the bike's battery was still at 75% #BikeLaneSweeper has way more battery (about 4hrs of running the brush) than the bike has for pulling it on hilly terrain. No I can't trade them because that's a 36v pack and has a different shape to the base (why are there 30 shapes to the base of a nearly identical battery?)

The bike battery was not fully charged at the beginning, maybe 85%, but it was down to 45.1V (28%!!?) and almost unable to pull the trailer, max ~150W in the lower "third" of the battery charge, but torque sensor requiring more torque to get even that where I would rather spin a higher cadence (I did walk-assist for one part of the hill on Cap Hwy NB to Texas.) So 57% of 620Wh is only 350Wh and 120W assist while pulling a trailer is not quick #eBikes