A useful specification keeps every decision connected

The equipment, battery and charger have to be approved as one operating system. Nominal voltage establishes compatibility, usable energy covers the working period, and continuous plus peak current keep the machine moving under its hardest load. Dimensions, terminal position, cable reach and restraint determine whether those electrical ratings can be installed safely. The charger then has to replenish the used energy inside the real downtime available, without creating excessive heat or an avoidable queue.

Fleet decisions should be tested against the hardest normal day rather than a catalogue average. Record payload, grades, travel distance, lifting time, accessories, temperature and idle periods. For a replacement program, include the oldest equipment still expected to remain in service. For an OEM program, add communications, compliance markets, enclosure protection, production tests and warranty handling. These details turn a headline capacity into an acceptance plan that both buyer and supplier can verify.

Total cost should use the same system boundary. Include usable energy, charging losses, planned maintenance, unplanned downtime, service labour, spare-battery requirements, freight, commissioning and expected replacement cycles. A higher initial price can be the lower-cost result when it removes watering, battery exchanges or charging-room congestion; a lower price can remain rational when utilisation is light and the existing infrastructure already fits. The correct answer comes from the operating model, not from chemistry alone.