Is 720 watt-hours worth the upcharge over 480 on a loaded cargo trike?

A watt-hour figure on a spec sheet is the only honest number in the whole listing, and it is also the one most shoppers skip past on the way to the advertised range. Voltage times amp-hours gives you watt-hours, so a 48-volt pack rated at 15 amp-hours holds 720, and a 48-volt pack at 10 amp-hours holds 480. That is a fixed quantity of stored energy. Everything downstream of it, the miles, the hills, the hauling, depends on how fast you spend it, and a three-wheeler loaded with a week of shopping spends it faster than the test rider did.

How the advertised range was produced

Range claims come from a controlled run, and the conditions of that run are almost always chosen to flatter the pack. Expect a light rider, the lowest assist setting, a flat and windless course, warm air, fully inflated tires, and steady pedaling that contributes real power. Some brands publish those conditions in the manual even when the marketing page omits them, which is the first thing a careful reader checks: find the range claim in the printed material, then look for the asterisk. If the manual quotes a range band rather than a single number, the low end of that band is the figure worth planning around.

The useful conversion is watt-hours per mile. On a flat city errand at modest assist, an adult trike with a rider and light cargo tends to draw somewhere in the low double digits of watt-hours per mile. Push the assist up, add a hill, add weight, add a headwind, and that figure climbs steeply rather than gradually. Divide your pack size by a realistic draw and you get a planning range that will not strand you, which is a different exercise from believing the box.

480 against 720, with the load aboard

The extra 240 watt-hours is a fifty percent increase in stored energy, and on paper it reads as a fifty percent increase in range. In practice it buys more than that in confidence and less than that in miles, because riders who know they have reserve tend to use higher assist. A 480-watt-hour pack suits a rider whose trips are short and repeatable: a two-mile grocery run, a mile to the train, a loop around the neighborhood, all with a charger waiting at the end. A 720 suits the rider who strings errands together, crosses the city, or lives at the top of something.

Weight is where the difference shows up most sharply. Forty pounds of groceries in the rear basket does not simply add forty pounds; it adds forty pounds of rolling resistance on every start, and city riding is mostly starting. Each stop sign is an acceleration paid for in watt-hours, and a trike with three contact patches already pays a small tax the two-wheelers do not. On a grade, the arithmetic gets blunt: lifting rider, trike, and cargo up a hundred vertical feet costs a fixed amount of energy no motor can discount.

What the pack costs you again, later

Lithium packs are consumables with a slow clock. Capacity fades with charge cycles and with calendar age, so a pack that held 720 watt-hours new will hold meaningfully less by its third or fourth winter even if the mileage was modest. Plan on replacement as a scheduled expense, not a failure. Replacement packs typically run a substantial fraction of what the whole trike cost, often the single largest line item in ownership after purchase, and the price gap between a 480 and a 720 widens rather than closes at replacement time.

The question a careful buyer asks the dealer is whether the pack will still be available. Proprietary packs that key into one frame generation can vanish from the catalog when the model changes, while packs built to a common standard, the familiar rear-rack and downtube formats, keep a supply chain behind them. Battery safety and recall authority for these products sits with the Consumer Product Safety Commission, which is worth knowing when you are weighing an unbranded replacement against the manufacturer's own. Ask, in writing, how long spares are stocked.

Reading the two options honestly

Buy the larger pack if your regular route has real elevation, if you carry weight most trips, or if charging at the far end is unreliable. Buy the smaller one if your errands are short, your building has an outlet, and the price difference buys better brakes or a stronger rack instead. Both answers are defensible. What is not defensible is choosing on the advertised range alone, since that number was produced under conditions you will never ride in.

Write down your three most common trips, add the grocery weight you actually carry, and multiply the miles by a pessimistic watt-hour draw. The pack that covers the worst of those three with room to spare is your pack.