12v 24v adjustable smart battery charger Easy to store and carry Convenient size --- small, light, powerful and compactEfficient heat dissipation ------ fan runs at a current-based speed and is very quiet. There are enough ventilation slots on the sides and bottom to keep the charger cool all the timeEasy to store --- There is a storage rack behind the charger, it does not require much space to store itLED screen--- Shows the voltage/current you are adjusting, and the voltage and current of the battery while it is charging Suitable for all types of batteries - boost your battery Electrolysis / Desulfurization / Battery upgrading / Life extension Perfect for charging dead batteries or trickle charging, can be used in extreme conditions without any problems. It can perform smart charging and stop automatically when the battery is full.The time to start up the vehicle may differ due to the depth of discharge and battery conditions. Normally charging 5-10 minutes is enough to start most vehicles. NOTE: NOT suitable for 6v batteries/ NOT suitable for lithium batteries ? What's the meaning of " manual"? The "manual" of PZP battery charger means: you can manually set the charging voltage with knob from 12 volt to 30 volts, and current from 0 to 15 amps. Then the next charging stages are automatic. ? When does it mean the battery is fully charged ? When the voltage reaches the set voltage, it means that the battery is 80% charged. When the current gradually decreases to 0.7±0.2A, this means the battery is fully charged. At this point, the charger will enter maintenance mode. ? How can I know what current and voltage I need to set？ You can follow our 'STANDARD MODE' if you don't know your battery type 12-volt: 14.4V, 2A 24-volt: 29V, 2A For more detailed usage, please refer to the following chart Different batteries charging parameter table Battery charger operation STEPS and NOTES 1. Plug in AC power and turn the switch "ON" 2. Set the charging voltage 3. Connect the 2 clips to battery 4. Set the charging current 5. Start automatic charging and maintain the battery Adjust charging voltage and current according to ambient temperature and type of battery Adjustable LOW voltage in the hot summer to prevent safety hazards from overheating Adjustable HIGH voltage to provides stronger engine start in winter, avoiding cold temperatures that cause no start WD-315 WD-210 WD-305 Battery Voltage 12V&24V 12V 12V Charging Voltage 12-30V 12-17.5V 12-17.5V Charging Current 0-15A 0-10A 0-5A Battery Clips ✓ ✓ ✓ O-ring Connector × × ×