The J+ Booster 2 is a 40 A, dual-voltage portable J1772 charger with an aluminium body and a 21 ft or 25 ft cord. It takes swappable NEMA 14-50 and NEMA 5-15 adapters. InsideEVs drove two pickup trucks over it, froze the cord and submerged the unit, and the charger kept working; it scored 4.4/5. EVchargerReviews.net (4.7/5) ran it at 40 A for hours with no thermal throttling and called it the most premium portable unit it had tested. It suits drivers who want one rugged charger for the garage and the road. Anyone with an existing NEMA 14-50 outlet installed upside down, or on a tight budget, should look elsewhere.
Full review
Survived being driven over by two pickup trucks
InsideEVs put the Booster 2 through its abuse tests. The unit is crush-rated to 6,600 lb, so the reviewers drove a Ford F-150 Lightning and a Rivian R1T over it. It came away with scratches and torn rubber end caps but worked perfectly afterwards. It also passed InsideEVs' connector drop test, and stayed submerged for longer than its 30-minute IP67 rating without failing. The one middling result was the cable deep-freeze test, where the cord earned an average score. InsideEVs gave the charger 4.4 out of 5 and added it to its list of recommended charging equipment.
Full 40 A output without throttling
EVchargerReviews.net used the Booster 2 as its main charger for several weeks, almost entirely in the maximum 40 A mode. It reported no errors on the car and no thermal throttling. After its 50 kWh stress test the charger and cord were in the low 90s Fahrenheit and only slightly warm to the touch, and the thermal camera showed no hot spot at the swappable input adapters. A single button cycles through current settings from 6 A to 40 A, and LED indicators show the mode. The reviewer charged a VW ID.4 and, through a NACS adapter, a Tesla Model Y without issue.
A one-foot input cable dictates where it mounts
The main drawback EVchargerReviews.net found is the input cable, which is only about a foot long and fairly rigid. The optional metal wall mount expects the charger to hang beneath the outlet, so the outlet's pin orientation matters. The reviewer's NEMA 14-50 had its round pin at the bottom, and the Booster 2 had to run upside down in the garage. The site advises new owners to have the outlet installed with the round pin at the top, at about eye level. Owners whose outlet is already wired the other way may need an electrician to flip it.
Premium price for its build quality
EVchargerReviews.net quoted $599 for the charger with a NEMA 14-50 adapter, and $649 for a bundle that adds the wall mount and a Level 1 adapter. InsideEVs listed $699.97 for the 21 ft version and $749.97 for the 25 ft version. EVchargerReviews.net called it the most expensive portable EV charger it had tested, but said the build quality and everyday durability justify the price. The 21 ft unit weighs under 8 lb, and its cord is 16 mm thick, which the reviewer found one of the easiest 40 A cords to handle.
Strengths
- +Kept working after InsideEVs drove an F-150 Lightning and a Rivian R1T over it
- +Ran for hours at 40 A with no thermal throttling in a 50 kWh stress test
- +IP67-rated, and it passed InsideEVs' submersion test after more than 30 minutes underwater
- +Metal locking input adapters are almost impossible to disconnect by accident
- +The 21-foot version weighs under 8 lb, light for a 40 A portable unit
Watch-outs
- −Input cables are only about a foot long, so outlet position and orientation matter
- −The most expensive portable charger EVchargerReviews.net has tested
- −The cord earned only an average score in InsideEVs' deep-freeze test
How it compares
The Booster 2 is a premium alternative to the Grizzl-E Mini Connect (40A) and the Splitvolt 40A NEMA 14-50. Its main selling points are a crush-rated aluminium body, IP67 sealing and swappable locking plug adapters. Its controls are a single button and LED indicators, so buyers who want an LCD and app scheduling may prefer the Lectron 40A J1772 Portable (Wi-Fi).
Rating sources
“We gave the J+ Booster 2 a final score of 4.4 stars out of 5 and added it to our list of recommended electric vehicle charging equipment.”
Counts as 4.81/5 in our score — this publisher's 1 scores on the site average 3.50, so its scores are adjusted up to compare fairly with other publishers.
“Our Rating: 4.7/5”
Our 4.6 score is the average of these published ratings, each adjusted for how strictly its publisher scores. More about methodology.
