“Heavy batteries prevent electric trucks from matching diesel freight work or lasting a working life”

Payload limits are real, but they depend on what the truck carries

A battery pack adds mass. Where a truck is legally limited by gross vehicle weight and its freight is heavy, part of the available weight can go to the battery instead of cargo. IEA's 2025 assessment says 18% of U.S. trucks operate close to the general maximum weight and another 7% exceed it, so a weight increase can matter to a meaningful subset of operations. The same report notes allowances for alternatively fueled trucks of 907 kg in the United States and 2,000 kg in the EU, which can compensate for some of the added mass. The effect varies with the applicable weight rules, axle limits, truck configuration and freight. Bulky, low-density cargo can fill the trailer before weight is reached, leaving no payload penalty from added battery mass on that trip. ^[2]

Large-scale operating data show both the constraint and the danger of reducing every result to payload. Zhao and colleagues analyzed 2021 monitoring records for 61,598 electric trucks in China and compared them with 55,411 diesel trucks. In their light-duty delivery segment (3.5–4.5 tonnes), 23% of diesel trucks were suitable for one-for-one replacement by current electric models; the corresponding share was 30% for diesel heavy-duty semi-trailers. When they normalized the observed fleets to the same total work demand, the mean replacement ratio was 3.8 electric delivery trucks or 3.6 electric semi-trailers for one diesel truck. ^[1]

The Chinese fleet ratios are about operations as well as mass

Those figures are a serious warning for the light-duty delivery and heavy-duty semi-trailer types and usage patterns represented in the study. They are not a finding that each electric truck carries only one-quarter of a diesel truck's cargo. The analysis combines daily mileage, active-trip frequency, usable battery range, charging and utilization; the electric fleets were often less intensively used than the diesel comparison fleets. In some truck categories, the daily routes were shorter than the electric trucks' available range, while long-haul semi-trailers needed frequent charging. The paper estimated that improving battery energy density and utilization could raise one-for-one feasibility above 85% for diesel semi-trailers, but this is a modeled possibility. It also modeled a 50% larger battery: payload fell 7% for semi-trailers, with an 11% CO₂ and 25% cost reduction in that scenario. This shows why adding battery capacity can solve a range issue while worsening cargo capacity. ^[1]

The IEA's 2026 review finds electric truck sales are growing fastest in China and are concentrated in predictable, short-route uses around ports, mines, steel and cement operations. That pattern is consistent with current trucks fitting some jobs better than others; it does not establish that long-haul freight is already solved everywhere. IEA also notes payload limits can require extra movements for low-volume, high-weight cargo, and that permitting extra mass can affect road maintenance. Both vehicle capability and freight economics matter. ^[3]

Truck battery life is not yet known from long fleet histories

Battery aging depends on chemistry, temperature, charge rate, time spent at different states of charge and the truck's duty cycle. A truck on regular depot routes has a different stress profile from one that charges rapidly between heavy long-haul trips. NREL's 2024 report describes a research program that uses real-world regional and long-haul drive cycles from Fleet DNA, simulates electric-truck power needs, and builds dynamic accelerated-aging tests at Idaho National Laboratory. The work is intended to establish battery testing protocols and requirements for heavy-duty trucks; it is not a multi-year count of pack failures in a representative commercial fleet. ^[4]

A May 2026 study of heavy-duty electric drayage trucks models NMC and LFP pack aging for Port of Savannah operations using semi-empirical models calibrated against experimental data. It finds that charging and storage practices can substantially affect modeled useful life, but explicitly notes the lack of publicly available large-scale operational degradation data from battery-electric Class 8 fleets. That is valuable evidence about mechanisms and the need to manage charging; it does not support a universal claim that packs fail before truck retirement, nor does it provide a population-wide truck-pack survival distribution. ^[5]

Avoid claims that exceed the evidence

The firm conclusion is that payload loss can be material for weight-constrained routes, particularly at present battery sizes, while many predictable or volume-limited operations can use electric trucks without an equivalent cargo penalty. Long-haul suitability must be evaluated for a particular battery, route, charging plan and legal weight limit. Battery longevity remains a live engineering question: current truck-specific evidence combines operating data, component experiments and models, but does not yet document full commercial pack lifetimes across a representative fleet. A warranty's duration or capacity threshold is a coverage term, not measured service-life evidence. Passenger-car battery replacement statistics do not resolve the truck question.