5VUPSBOARD Uninterrupted Power Supply Module DC 5V 1A UPS 18650 lithium battery protection board Key benefits Provides a stable 5V output at up to 1A, backed by a UPS mode that automatically uses a connected battery when main power is unavailable. Compatible with Lipolymer batteries and 18650 lithium cells; recommended battery capacity is less than 10000 mAh. Protects both input and battery with builtin safeguards: reverse connection protection and input overvoltage protection; if input voltage rises above 6V, input power is cut off and the unit switches to battery power. Battery and output terminals include protective features to prevent damage during charging and normal operation; the design is intended for safe, reliable operation with ordinary loads. Specifications Input: above 5V1A Output: 5V1A (max) Battery: Lipolymer battery, 18650 lithium battery (Recommended capacity is less than 10000mA) Input terminal: reverse connection protection, protection from input overvoltage, automatic cutoff of input power when the input exceeds 6V and switch to battery power mode Terminal protections Battery terminal: reverse connection protection and short circuit protection; reverse connection will not be damaged when charging. Note: if the external power input exceeds 20V, the protection unit may be faulty. Output terminal: can only supply ordinary loads; cannot be connected to other power adapters and will burn if connected backwards Notes Battery capacity is displayed by the flashing frequency: faster blinks indicate greater capacity; the unit will automatically shut down when the battery is low or not charged. The module may heat during charging; keep the module away from the battery when mounting. Observe polarity when connecting the battery. Use scenarios Prototyping and development: keep microcontroller projects, sensors, and other 5V electronics running during brief power interruptions or when testing firmware. IoT and remote sensing deployments: provide a reliable 5V power source for devices in locations with unstable mains, ensuring continuous operation for data collection and monitoring. Small singleboard computer backup: spacesaving UPS for devices like Raspberry Pi and similar boards to protect against power outages and prevent SD card corruption, while staying within the 5V1A output capability.