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 jump-start power

🔋7Ah lead-acid battery capacity

🔌3.1A triple USB charging ports

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€ 209.52

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power up your peace of mind — never get stranded again!

SMART SAFETY ALERT - Reverse polarity alarm prevents costly connection mistakes
POWER HUB ON THE GO - Triple USB ports deliver 3.1A to keep your devices charged and ready
COLD WEATHER WARRIOR - Lead-acid battery optimized for reliable performance in low temperatures
WORK ANYWHERE ANYTIME - 270° rotating high-powered LED light for night or low-light emergencies
INSTANT ROADSIDE RESCUER - 600 peak amps to jump-start V6 engines without another vehicle

The STANLEY J309 Portable Power Station Jump Starter packs a powerful 600 peak amps to jump-start cars, trucks, and SUVs up to V6 engines. Featuring a 7Ah lead-acid battery, it includes a smart reverse polarity alarm for safe use, a 270-degree rotating LED light for visibility in the dark, and triple USB ports (3.1A total) to charge your devices. Compact and cold-weather ready, it’s your essential emergency power companion with easy household charging and a 1-year warranty.

Specifications

ASIN	B001U04NCA
Amperage	300 Amps
Battery Capacity	7 Amp Hours
Battery Type	Lead Acid
Best Sellers Rank	#217,868 in Automotive ( See Top 100 in Automotive ) #527 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 Amps
Specification Met	UL
UPC	897450002377
Unit Count	1.0 Count
Voltage	12 Volts

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€ 209.52

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Austria.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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