Features: 1. The DC UPS motherboard is available in two versions to choose from, with the standard version rated for 24W charging of about 1A and the downgraded version rated for 18W charging of about 0.5A; 2. With indicator lights and external dual color LED indicator lights; 3. Supports multiple charging methods, including trickle, constant current, and constant voltage three-stage charging; 4. Multi functional, supporting charging, battery boosting, switching, and over discharge protection product functions; 5. Compact in appearance, suitable for various scenarios without taking up space. Parameter: Style 1: Standard Edition Color: Red style Input voltage: DC12V/DC15V Output voltage: DC12V/DC15V Product power: Rated 24W (usable 18W) Standard version charging: about 1A Applicable batteries: 7.4V-8.4V lithium batteries No load power consumption: 0.2-0.3mA<0.5mA Indicator light: External dual color LED indicator light Product features: charging+battery boost+switching+over discharge protection Working voltage: default 12V mode/input current should be ≥ 3A Battery capacity: slow charging for 4-6 Ah, fast charging for 4-12 Ah Charging voltage: Voltage range 8.2-8.4V (average 8.3V) Discharge voltage: When the battery is below 6.0V-6.4V, it will automatically disconnect Path loss: FUSE and SS54 have a loss of approximately 0.4V-0.6V Battery type: 7.4-8.4V lithium battery/supports 18650 Charging method: Trickle current/constant current/constant voltage three-stage charging Charging current: Fast charging mode approximately 0.9A-1A Charging current Switching threshold: When the IN voltage drops by 0.8V, switch to battery power supply Size: 50mm * 20mm (± 0.5mm) Battery capacity support range: slow charging 4-6Ah, fast charging 4-12Ah, maximum capacity 7.4V 15Ah *This version of the charging chip does not have a battery capacity limit. When the battery quality is good, you can try to match the fast charging mode with 20-30Ah Style 2: Downgraded Edition Color: Red style Product power: rated 18W (usable 12W) Downgraded version charging: about 0.5A Input voltage: DC12V/DC15V Output voltage: DC12V/DC15V Applicable batteries: 7.4V-8.4V lithium batteries No load power consumption: 0.2-0.3mA<0.5mA Indicator light: External dual color LED indicator light Product features: charging+battery boost+switching+over discharge protection Working voltage: default 12V mode/input current should be ≥ 3A Battery capacity: slow charging for 4-6 Ah, fast charging for 4-12 Ah Charging voltage: Voltage range 8.2-8.4V (average 8.3V) Discharge voltage: When the battery is below 6.0V-6.4V, it will automatically disconnect Path loss: FUSE and SS54 have a loss of approximately 0.4V-0.6V Battery type: 7.4-8.4V lithium battery/supports 18650 Charging method: Trickle current/constant current/constant voltage three-stage charging Charging current: Fast charging mode approximately 0.9A-1A Charging current Switching threshold: When the IN voltage drops by 0.8V, switch to battery power s