The 5KWh modular stackable energy storage battery adopts a split stacking structure with flexible multi-unit capacity expansion, suitable for household energy storage upgrading and small project standby power. It fits 48V low-voltage universal inverters and is widely compatible with mainstream low-voltage energy storage equipment. With stable and durable cells, it has a 12-year service life and up to 8200 ultra-long cycles with low long-term capacity attenuation. Rated IP30, it is applicable to dry indoor environments. The independently replaceable modules enable convenient maintenance and low cost with higher cost performance than traditional batteries.