[EXTENDED RANGE]: Connect two batteries to increase riding distance for long e-bike trips without frequent stops [SMART SWITCHING]: Auto cycles between battery groups based on set voltage points to balance discharge efficiently [DUAL CHARGING]: Built-in port allows charging both batteries simultaneously to save time and simplify power management [SINGLE MODE]: Supports single battery output when connected to A or B separately for flexible power supply options [ALUMINUM BUILD]: Compact 20A module fits 20V-72V systems with heat-resistant aluminum material for stable performance