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 600 Amp Jump Starter | Portable Power Station 3.1A USB Ports

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 jump-start power

🔋7Ah lead-acid battery capacity

🔌3 USB ports for device charging

169574CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay charged, stay unstoppable—your ultimate roadside lifesaver!

COLD WEATHER READY - Reliable SLA battery technology performs even in freezing temperatures.
POWER UP INSTANTLY - 600 peak amps to jump-start V6 engines and beyond—never get stranded again.
SMART SAFETY ALERT - Reverse polarity alarm protects your vehicle and you from incorrect connections.
CHARGE ALL YOUR DEVICES - Triple USB ports keep your phone and gadgets powered on the go.
ILLUMINATE YOUR EMERGENCY - 270° rotating high-powered LED light to keep you working confidently in the dark.

The Stanley J309 Portable Power Station Jump Starter delivers 600 peak amps to jump-start cars, trucks, and SUVs with V6 engines. Featuring a 7Ah lead-acid battery, it includes a reverse polarity alarm for safe connections, a 270-degree rotating LED light for nighttime use, and triple USB ports to charge your devices. Compact and cold-weather ready, it’s designed for reliable roadside assistance and everyday power needs.

Specifications

ASIN	B001U04NCA
Amperage	300 A
Battery Capacity	7 amp_hours
Battery Type	Lead Acid
Best Sellers Rank	#314,155 in Automotive ( See Top 100 in Automotive ) #616 in Jump Starters
Brand Name	STANLEY
Compatible with Vehicle Type	Passenger Car
Customer Reviews	4.1 4.1 out of 5 stars (2,779)
EU Spare Part Availability Duration	5 years
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 Type Name	Portable Power Station Jump Starter
Item Weight	8.5 pounds
Manufacturer	Baccus Global LLC
Manufacturer Part Number	J309
Manufacturer Warranty Description	1 year warranty
Model Number	J309
Peak Output Current	600 A
UPC	897450002377
Unit Count	1 Count
Voltage	12 volts

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