The battery management system handles the charging lock, current limiting and discharge protection. NCM and NCA perform better in the cold, while LFP is safer and longer lived but depends more on preheating.
Roughly half of the differences in winter battery behaviour come from the cell chemistry and half from the battery management system. For B2B partners, understanding both layers is what makes it possible to explain, during selection, quotation and warranty assessment, why two models behave differently at the same temperature.
The battery management system has three duties in the cold. The first is the charging lock: when cell temperature falls below 0 °C it interrupts or refuses the charging path, which is the final gate against lithium plating. The second is current limiting: even once charging is permitted, the accepted current is scaled with temperature, and the colder the pack the lower the ceiling. The third is protection on the discharge side: peak power is limited at low temperature so that voltage sag does not push the system into undervoltage protection and an abrupt cut-off.
One phenomenon is regularly misunderstood: the display shows zero charging power after the charger is connected. In most cases the battery management system is waiting for the cell temperature to enter its window, and this is not a fault. Some packs with a heating film first use a small amount of energy to drive the film and preheat the cells to a temperature that accepts charge, and only then begin normal charging. The correct action for the user is to wait, not to reconnect repeatedly or replace the charger.
Regarding cell chemistry, nickel based systems (NCM and NCA) usually retain more capacity and deliver more power at low temperature than lithium iron phosphate (LFP), and their voltage platform is also more favourable for cold discharge. LFP leads in cycle life, thermal stability and safety, but needs more preheating support for cold charging. Selection is not a contest of better or worse, it is a matter of matching the application: fleets in severe northern cold or with fast rotation should weigh low-temperature charge acceptance heavily, while applications that prioritise long life and high safety suit LFP.
QERYU follows the same approach on both paths: low-temperature boundaries are written into the control logic through battery management system calibration, an optional heating film covers severe cold and fast rotation, the battery compartment insulation slows temperature loss while riding, and product documentation states the recommended temperature ranges explicitly: discharge from minus 10 °C to 45 °C, charging from 0 °C to 45 °C, with an optimum range of 10 to 30 °C in both cases. Channel partners can hand customers a winter specification that is clear, verifiable and executable.