It's a jump starter, not a charger. The 12V jump starter JS-530 designed to deliver a high burst of power (up to 1500A peak current) to instantly restart a dead 12V car battery. It does not gradually charge your car battery like a traditional battery charger would.

It depends on the condition of your battery.The JS-530 delivers a peak current of 1500A, powerful enough to start most 12V vehicles up to 5.0L gasoline and 2.0L diesel engines—even when the battery is low or nearly dead.If your car battery is completely dead—meaning 0 volts, severely sulfated, or damaged internally, the JS-530 may not be able to jump-start it.

It depends on how and when you need power.The portable jump starter JS-530 features nighttime emergency lighting last about 37hours.
Calmly respond to emergencies with three lighting modes: lighting, strobe, and SOS rescue.Choose a battery charger if your car sits unused or you’re looking to maintain battery health long-term, a battery charger is the better fit.

In fact, it’s a safe and effective way to bring a dead battery back to life—especially with a smart, portable jump starter like the Carku JS-530.Using the JS-530's safety features durable lithium cells, the lithium battery is rated for ≥1000 charge cycles,built to last through many emergencies.