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J+ Booster 2

Forty amps, IP67, drive-over resistant to 6,600 pounds, and 2.2 pounds without cables. A portable built to a standard portables usually are not.

By Sawyer V. · Published September 8, 2026

An electric car traveling on a highway
Illustrative photo of EV travel, not the J+ Booster 2.

How this page is funded: we earn a commission if you buy through our Amazon links, at no extra cost to you. It does not change what we recommend, and we say plainly when the honest answer is to buy nothing. Full disclosure.

The short version: the J+ Booster 2 is the portable that closes the gap with a wall unit. At 40 amps it matches many fixed chargers, and its published IP67 rating, aluminum body and drive-over resistance address the thing that usually kills portables -- the abuse of being carried around.

The two specs that make it different

Eight current settings, from 6 A to 40 A. That range is what makes a portable genuinely portable. A fixed 40-amp unit is useless on a 20-amp circuit; this one steps down to fit whatever it finds. On an unfamiliar outlet at someone else's house, the ability to dial to 16 amps is not a luxury.

2.2 pounds without cables. A charger that lives in a trunk gets moved constantly, and weight is what decides whether you actually carry it. With cables and adapters it is 7 pounds, which is still a bag rather than a project.

The arithmetic

At 40 A on a NEMA 14-50: 40 x 240 = 9.6 kW, about 34 miles of range per hour

At 16 A on a smaller circuit: 3.8 kW, about 13 miles per hour

At 12 A on a standard 120 V outlet: 1.4 kW, about 5 miles per hour

Over 10 hours at 40 A: about 340 miles.

1. The best portable overall

J+ Booster 2

J+ Americas · J1772 · 40 A / 9.6 kW · 25 ft cable

A 40 A portable in a military-grade aluminum body, ETL certified to UL standards and IP67 rated, weighing 2.2 lb without cables. The portable that behaves like a wall unit.

What is good

  • 40 A, matching many wall-mounted units
  • Eight amperage settings from 6 A to 40 A, so it fits almost any outlet
  • Adapters for a wide range of outlets, including NEMA TT-30 for campgrounds
  • IP67 and drive-over resistant, which portables usually are not
  • 2.2 lb without cables, so it genuinely travels

What is not

  • Costs more than most portables, and more than some wall units
  • Every extra outlet adapter is a separate purchase
  • Still a portable, so it is not rated for permanent outdoor mounting
Published specifications for the J+ Booster 2
Maximum output40 A / 9.6 kW at 240 V
Adjustable6, 8, 12, 16, 20, 24, 32 or 40 A
Power range1.4 kW to 9.6 kW
ConnectorSAE J1772
Cable21 ft or 25 ft, depending on version
Adapters includedNEMA 14-50 and 5-15
Further adapters available5-20, 6-15, 6-20, 6-50, TT-30
Weight2.2 lb without cables; 7 lb with cables and adapters
BodyMilitary-grade aluminum, drive-over resistant to 6,600 lb wheel loads
RatingIP67 waterproof and dustproof
CertificationETL certified to UL standards

Skip this if: Skip it if you only ever charge in one place. A hardwired wall unit is cheaper for a fixed installation.

Specifications above are the manufacturer’s published figures. Source: J+ Americas. We have not tested this unit — see how we pick.

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The adapter ecosystem

NEMA 14-50 and 5-15 adapters are included; 5-20, 6-15, 6-20, 6-50 and TT-30 are available separately. That covers essentially every outlet you would legitimately plug into -- see outlet types for what each one delivers. Note that each additional adapter is a separate purchase, which adds up.

Who should not buy it

  • You only ever charge in one place. A hardwired wall unit is cheaper and faster for a fixed installation.
  • Budget is the constraint. The Lectron and MUSTART units cost less and charge the same car.
  • You want it permanently outdoors. IP67 is a strong rating, but this is still a portable and not intended as a fixed outdoor installation.

FAQ

Questions people actually ask

How fast is the J+ Booster 2?
Up to 40 A / 9.6 kW on a NEMA 14-50, roughly 34 miles of range per hour, or about 340 miles over a ten-hour night. It also steps down to as little as 6 A for smaller circuits.
Is the J+ Booster 2 certified?
The manufacturer publishes ETL certification to UL standards, plus an IP67 waterproof and dustproof rating.
What adapters come with the J+ Booster 2?
NEMA 14-50 and 5-15 are included. Adapters for 5-20, 6-15, 6-20, 6-50 and TT-30 are available separately.
How much does the J+ Booster 2 weigh?
2.2 lb without cables or adapters, and 7 lb with them, per the manufacturer's published figures.

Sources

Where these numbers come from

  1. Portable Level 2 EV charger 40A (UL) -- J+ Booster 2 — J+ AmericasOutput, current settings, adapters, weight, IP rating and certification.

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