1. Mini UPS uninterruptible power supply is a standby energy storage power supply.; 2. Used safe and environmental lithium cells, credible and stable PCB, trickle/constant-current/constant-voltage lithium battery charging BMS,; 3. Created by high performance and efficiency DC-DC, boosting and switching circuit.; 4. This mini UPS with perfect over-charged, over-discharged, over-current and short-circuit protection.