Split‑type energy storage batteries cover wall‑mount, floor‑standing and stackable versions. Residential capacity ranges 5‑30kWh with 51.2V as mainstream voltage. Small households choose 5‑10kWh with 3.6‑6kW inverters; high‑demand villas adopt 15‑20kWh with 8‑12kW inverters. Stackable types are preferred for future expansion. Global market grows driven by peak‑valley arbitrage and blackout backup demand. Critical buying factors: smart BMS, Grade‑A cells, ≥4000 cycles, inverter communication compatibility, installation condition and safety certifications. Focus on capacity warranty instead of simple whole‑unit warranty to avoid low‑quality recycled‑cell risks.