The charging time of three-wheel tricycle batteries is affected by battery type, capacity, voltage, charger power and residual power, and standardized charging duration is not only related to charging efficiency but also directly determines the battery service life. Different configurations of tricycle batteries have fixed standard charging cycles, and mastering accurate charging time can avoid battery damage caused by insufficient charging and over-charging, ensuring the battery’s full capacity release and long-term stable use.

For the most common 72V lead-acid battery packs used in passenger tricycles (such as 72V20Ah, 72V30Ah, 72V32Ah), the standard charging time is clearly graded according to residual power. When the battery residual power is 20%–30% (the most suitable charging state for daily use), the conventional matching 72V lead-acid special charger takes 6–8 hours to complete full charging. The charging process is divided into two stages: constant current fast charging and constant voltage floating charging. In the first 4–5 hours, the charger works in constant current mode to quickly supplement most of the power; in the later 2–3 hours, it switches to constant voltage floating charging to repair the battery internal chemical activity and fill up the residual power. If the residual power is higher than 40%, the charging time can be shortened to 4–6 hours; if the battery is deeply discharged (residual power less than 10%), the charging time needs to be extended to 8–10 hours, but long-term deep discharge and long-hour charging should be avoided.

For 72V lithium batteries for three-wheel tricycles, the charging time is slightly different from lead-acid batteries due to different charging mechanisms. The lithium battery has no floating charging repair process, and the charging efficiency is higher. For a 72V30Ah lithium battery with 20% residual power, the standard charging time is 5–7 hours with a matching lithium battery special charger. The charger will automatically stop charging when the battery is full, without the need for prolonged floating charging. Continuing to charge after full load will not improve the battery capacity but will trigger the battery protection board’s over-charging protection, resulting in repeated charging and discharging cycles and accelerating lithium battery aging.