[Smart Auto Battery Charger ] It is very simple and can automatically recognize 12V and 24V voltages.Although he has very few functions, many of them are added to his motherboard and do not require you to perform too many operations, such as the following core functions [Five Major Modes] No-Load Mode (Charger automatically stands by during poor contact or battery replacement!) Constant Current Mode (Provides steady current to blue screens when battery voltage drops below charger's set voltage, protecting the battery!) Constant Voltage Mode (PWM precisely controls input current and output voltage to ensure full battery charge and prevent overcharging!), Float Charge Mode (provides low-voltage charging when the battery nears full capacity, gradually completing the charge), Trickle Charge Mode (delivers a very weak current when the battery reaches full capacity to balance the charge level! Indicates charging is complete!) [Daily and Repair Functions] Press the button to activate Daily Mode for normal charging. For battery repair, press the button to switch to Repair Mode. This mode can restore old or idle batteries and extend their lifespan. If the battery fails to charge normally, use Repair Mode. Its high-frequency and low-frequency pulse technology helps revitalize and reactivate batteries, but it is ineffective for completely dead, damaged, or lithium batteries. [Battery Charger] This 12V/24V smart battery charger is a versatile all-in-one solution that functions as a charger, maintainer, trickle charger, and desulfator. It is suitable for all 12V and 24V lead-acid batteries, including AGM, GEL, SLA, and flooded batteries, and is applicable to vehicles such as cars, trucks, SUVs, motorcycles, lawn mowers, and boats. [Safe and Reliable] Operates reliably from -20°C to 50°C. Features reverse polarity protection, over-temperature protection, short-circuit protection, low-voltage protection, standby connection protection, high/low power selection, over-current protection, and high-voltage protection. [Auto Voltage Recognition] Use Motorcycle Mode for smaller batteries (6-20A) and Car Mode for larger batteries (20A+). AIERSUI 12V/24V Smart Battery Charger, 6AH~200AH lithium ion battery charger, Automatic Battery Maintenance、Pulse Repair & Trickle Charger, Suitable for Motorcycles, Boats, Cars, Lawnmowers, etc.