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.

Manufacturer	‎Dong guan Carosstech Co., Ltd
Brand	GIMFOOM
Package Dimensions	27.3 x 15.29 x 11.71 cm; 960 g
Batteries	1 Lithium Ion batteries required. (included)
Item model number	S4000
Manufacturer Part Number	S4000
Amperage	4000 Amps
Manufacturer	‎Dong guan Carosstech Co., Ltd
Country of Origin	USA
Item Weight	960 g

S4000 Battery Starter, 4000A Peak Car Jump Starter for Up to 10.0L Gas and 10.0L Diesel Engines

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