How long does it take to charge fully the S4000 jump starter using the 15W wall charger?

If it's completely dead it takes about 5 - 6hrs. I had about 24 percent and it took 4hrs. You can use a 35w charger and it takes only 3hrs. I used the charger from my Samsung phone.

Can the jump starter battery pack work without a car battery? Or with a very low voltage? ?

Hi Valued Customer, Yes, the jump starter can jump-start your car when your car's battery is totally dead, or the battery voltage is extremely low. If you encounter any problems that cannot be started, you can contact us at any time.

how long can the jump starter be stored after being fully charged while not in use??

Hi Valued Customer, Our jump starter battery pack supports a 24-month standby state, but if the jump starter is not used for a long time, it will enter the sleep state. If you haven't used it for a long time We recommend that you recharge your jump starter every three months to keep it healthy.

Can the jump starter display the voltage of the battery it is trying to jump?

It doesn't display the battery voltage but it does tell you if there are Any problems or any bad cells with the e battery to be jumped.

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Description

⚡ Stay charged, stay ready—jumpstart your journey with power and style!

SMART 3 4 INCH LCD DISPLAY - Real-time status, power level, and error alerts at a glance—tech-savvy control in your hands.
POWERFUL 4000 A PEAK CURRENT - Instantly jump-starts even fully drained 12V batteries with up to 70 emergency starts—never get stranded again.
MULTI FUNCTIONAL 6 IN 1 DESIGN - Jump starter, power bank, flashlight (400 lumens), SOS/strobe modes, and dual USB outputs—your all-in-one roadside companion.
VERSATILE ENGINE COMPATIBILITY - Supports up to 10L gas and diesel engines—perfect for cars, trucks, motorcycles, RVs, and more.
ADVANCED 10 POINT SAFETY SYSTEM - Comprehensive protections ensure safe use in extreme temperatures (-4°F to 140°F)—confidence meets cutting-edge tech.

The GIMFOOM S4000 is a robust 4000A peak current 12V jump starter designed for professional-grade reliability. It supports up to 10L gas and diesel engines, features a smart 3.4-inch LCD display for real-time monitoring, dual USB fast charging ports, and a powerful 400-lumen LED flashlight with SOS modes. Engineered with 10 advanced safety protections, it ensures safe and efficient jump starts in extreme conditions, making it an essential multi-functional tool for any vehicle owner.

Specifications

Manufacturer	GIMFOOM
Brand	GIMFOOM
Item Weight	2.12 pounds
Package Dimensions	10.75 x 6.02 x 4.61 inches
Item model number	S4000
Batteries	1 Lithium Ion batteries required. (included)
Manufacturer Part Number	S4000
Bulb Type	400 Lumen LED Flashlight (flashlight/SOS/strobe)
Special Features	10 Intelligent Protection Systems, 2 Years of Product Quality Maintenance, 24-Month Stand-By, 3.4'' Intelligent LCD Screen, 400 Lumen LED Light (flashlight/SOS/strobe), 4000A Peak Current Jump Starter, Dual USB Output (5V/3A, 9V/2A, 12V/1.5A) and (5V/2.4A), Life: 1000+ Cycles, Suitable for 12V cars, SUVs, Motorcycles, RVs, Tractors, Lawnmowers, ATVs, Heavy-Duty Trucks, Snowmobiles, Cargo Vans, Oil Boats, etc, Up to 10.0L Gas/10.0L Diesel, Water-Proof, Dust-Resistant, Anti-Drop
Amperage	4000 Amps

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