Is this the type of jumper that you charge inside, by plugging it in, then you are able to jump-start your car with nothing plugged in.

Yes, you can charge it in the house or garage, then you can carry it down the driveway, or down the street... My last one I would charge it up about every 4 weeks to every 6 weeks. I believe I was able to Jump-Start 3 vehicles, but possibly a 4th one, without any issues.... Although this Unit is not really light like one of those Small Hand Held Units, These Units are larger/heavier ones. They can handle Stronger Boosts, and For Longer Periods Of Time..... I'm also getting Battery Tester. Amazon has one for $12.88 Prime 2-Day Shipping. That way I know if it's a Battery Issue, Alternator Issue, or when it's showing a Full Charge, then only starts with someone Jumping the vehicle, then it's probably the Starter....

is there a DC converter from 120v to 240v? my country (singapore) is using 240v wall socket

Yes, I've ordered a small one (200watts) recently off Amazon. The Simran SMF-200 Delux Step Down Voltage Converter...

can you use it to charge a cell phone? Could you use it to run portable dvd players?

Yes and yes. As long as you don't exceed 5 amps. And I believe those two things qualify

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J309

Product ID: 1202394

Details

Battery Cell Composition
Lead Acid
Brand
STANLEY
Product Dimensions
10"D x 4.5"W x
Vehicle Service Type
Passenger Car
Voltage
12 volts

⚡600 peak amps power

💡270° rotating LED light

🔋Triple USB charging ports

P7895

Duties & taxes included

In stock

Sold byAmazon BotswanaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power up your ride and your devices—never get stranded in the dark again!

ALL WEATHER READY - Reliable lead-acid battery performs in cold climates, perfect for winter emergencies.
SMART SAFETY ALERT - Reverse polarity alarm prevents costly connection mistakes, keeping you safe.
BUILT IN WORK LIGHT - High-powered LED rotates 270° so you can tackle roadside fixes anytime, anywhere.
INSTANT POWER BOOST - 600 peak amps to jump-start V6 engines effortlessly, no second vehicle needed.
MULTI DEVICE CHARGING HUB - Triple USB ports deliver 3.1A total to keep your devices powered on the go.

The STANLEY J309 is a compact, portable 600 peak amp jump starter designed for cars and trucks up to V6 engines. Featuring a reverse polarity alarm for safe connections, a 270-degree rotating LED work light, and triple USB ports for device charging, it’s built to handle cold weather and roadside emergencies with ease. Rechargeable via standard extension cord, it’s your all-in-one power solution for on-the-go confidence.

Specifications

ASIN	B001U04NCA
Amperage	300 A
Battery Capacity	7 amp_hours
Battery Type	Lead Acid
Best Sellers Rank	#478,766 in Automotive ( See Top 100 in Automotive ) #785 in Jump Starters
Brand Name	STANLEY
Compatible with Vehicle Type	Passenger Car
Customer Reviews	4.1 4.1 out of 5 stars (2,779)
Global Trade Identification Number	00897450002377
Included Components	Power Station
Item Dimensions D x W x H	10"D x 4.5"W x 11"H
Item Highlight	Portable Power Station 3.1A USB Ports
Item Type Name	Portable Power Station Jump Starter
Item Weight	8 pounds
Manufacturer	STANLEY
Manufacturer Part Number	J309
Manufacturer Warranty Description	1 year warranty
Model Number	J309
Number of Items	1
Number of Packs	1
Peak Output Current	600 A
UPC	897450002377
Unit Count	1 Count
Voltage	12 volts

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