LOKITHOR J400 2000A 12V Portable Lithium Jump Starter, Car Battery Booster Pack, USB-C Powerbank Charger, and Jumper Cables for Upto 8.0-Liter Gas and 6.0-Liter Diesel $32.38

unome

Pro

Apr 9, 2026 12:45 PM

919 Comments

Joined Jun 2006

unome

Pro

Apr 9, 2026 12:45 PM

919 Posts

Bought one of these in red awhile back to replace an 8 year old unit that no longer did it's job.
Works well. Longevity is unknown. Wonder if there is a way to test an older unit without having a vehicle with a bad battery? Load tester?
Anyhow, seems like a nice unit and it worked when I needed it to.

1

-MoistTowelette-

Apr 9, 2026 12:48 PM

944 Comments

Joined Jun 2012

-MoistTowelette-Apr 9, 2026 12:48 PM

944 Posts

Quote from unome

:

Bought one of these in red awhile back to replace an 8 year old unit that no longer did it's job.Works well. Longevity is unknown. Wonder if there is a way to test an older unit without having a vehicle with a bad battery? Load tester?Anyhow, seems like a nice unit and it worked when I needed it to.

Do you keep it in your car? I'm wondering how it holds up in a closed vehicle in 100 degrees weather.

unome

Pro

Apr 9, 2026 2:06 PM

919 Comments

Joined Jun 2006

unome

Pro

Apr 9, 2026 2:06 PM

919 Posts

Quote from -Gossamer-

:

Do you keep it in your car? I'm wondering how it holds up in a closed vehicle in 100 degrees weather.

That might have been why the 8 year old unit stopped working as it had only been used a handful of times.
I only charge them a couple times a year if that. and never in the car.

I have jump units in each car (3) and haven't had any issues yet.

I will say that the times that we used them they do what they say and save a ton of time and aggrivation.

mja28

Apr 9, 2026 3:54 PM

2.6K Comments

Joined Apr 2013

mja28Apr 9, 2026 3:54 PM

2,607 Posts

Quote from -Gossamer-

:

Do you keep it in your car? I'm wondering how it holds up in a closed vehicle in 100 degrees weather.

I got Gooloo 800A in my car since 2018. Goes over 100° in the summer here in Illinois. Zero issues so far. If money isn't an issue, get one with LFP battery https://a.co/d/01A7bPlJ ($75 after coupon)

MaroonPocket778

Apr 9, 2026 6:12 PM

458 Comments

Joined Nov 2019

MaroonPocket778Apr 9, 2026 6:12 PM

458 Posts

Their other Lifepo4 model is better and safer and will last longer

rczrider

Apr 9, 2026 7:02 PM

2.9K Comments

Joined Jun 2014

rczriderApr 9, 2026 7:02 PM

2,854 Posts

Quote from MaroonPocket778

:

Their other Lifepo4 model is better and safer and will last longer

100%, assuming you can get it on sale for less than $50. I mean, it's still "better" at its current $75 price ($100 with 25% off coupon), but unless you need it now, I'd still wait for it to drop again.

jeffster06

Apr 9, 2026 10:17 PM

241 Comments

Joined Nov 2017

jeffster06Apr 9, 2026 10:17 PM

241 Posts

Quote from unome

:

Bought one of these in red awhile back to replace an 8 year old unit that no longer did it's job.Works well. Longevity is unknown. Wonder if there is a way to test an older unit without having a vehicle with a bad battery? Load tester?Anyhow, seems like a nice unit and it worked when I needed it to.

Came here to say the same thing! It seems like a great unit. Used it several times since getting it prime day last year

wanderingneko

Apr 11, 2026 9:00 PM

4 Comments

Joined Nov 2014

wanderingnekoApr 11, 2026 9:00 PM

4 Posts

Bought this model a few months back. Works great. Simple to use. I have a bad battery which reads between 8-10v every time I hook this up. At full charge, this has given me about 3-4 starts. I think it'll give me 1 more start after that but im scared to try and get stranded somewhere. I keep it in my car with its case and its been around 90F but I dont think it did anything to it. This is for an 07 camry v6.

sky0102

Apr 12, 2026 2:52 AM

942 Comments

Joined Jul 2011

sky0102Apr 12, 2026 2:52 AM

942 Posts

UL listed, nice.

-MoistTowelette-

Apr 14, 2026 9:10 PM

944 Comments

Joined Jun 2012

-MoistTowelette-Apr 14, 2026 9:10 PM

944 Posts

Quote from sky0102

:

UL listed, nice.

Yea, I like that in the Amazon specifications it states that 'Specification Met: CE, ETL, UL' like my NOCO Genius 1 states.

jtf

Apr 18, 2026 2:24 PM

39 Comments

Joined Aug 2010

jtfApr 18, 2026 2:24 PM

39 Posts

Quote from -MoistTowelette-

:

Do you keep it in your car? I'm wondering how it holds up in a closed vehicle in 100 degrees weather.

Try keeping it in an insulated lunch bag under the front seat.

-MoistTowelette-

Apr 18, 2026 5:13 PM

944 Comments

Joined Jun 2012

-MoistTowelette-Apr 18, 2026 5:13 PM

944 Posts

Quote from jtf

:

Try keeping it in an insulated lunch bag under the front seat.

You've kept your battery jumper in an insulated bag under your front seat for how long? Why did you choose to store yours in an insulated bag? Seems odd.

-MoistTowelette-

Apr 20, 2026 7:41 PM

944 Comments

Joined Jun 2012

-MoistTowelette-Apr 20, 2026 7:41 PM

944 Posts

I got the J400 jump starter but not sure if I'm going to keep it. For one thing, the multimeter is very off since it reads 12.2V on my full 12V auto batteries and my other 3 multimeters read 12.8V. The other thing is that the jumper clamps barely fit on the main vehicle 12V battery I bought it for since they are so huge. I dunno why they made them so comically big.

rczrider

Apr 21, 2026 2:42 PM

2.9K Comments

Joined Jun 2014

rczriderApr 21, 2026 2:42 PM

2,854 Posts

I'm trying to figure out what's up with this unit. When this was posted, the listing showed 8000mAh capacity. Sometime not long after - and supported by some reviews - the capacity dropped to 6400mAh. The product listing on the LOKITHOR site still shows 8000mAh: https://www.lokithorshop.com/prod...ed-2000amp

I'm wondering if they changed their battery from 4S (14.8V) to 3S (11.1V). Several of NOCO's lower models use 3S/11.1V, so it's not inherently bad and really shouldn't be an issue; in fact, it would slightly bump the continuous amperage. If they didn't go from 4S to 3S, then this thing is going to struggle to jump anything that isn't a 4-cylinder in warm weather.

8Ah x 3.7V = 29.6Wh capacity
29.6Wh / 14.8V = 2Ah available for jump / air
80C x 2Ah = 160A continuous output (320A assumed peak)

6.4Ah x 3.7V = 23.68Wh capacity
23.68Wh / 11.1V = 2.13Ah available for jump / air
80C x 2.13Ah = 170A continuous output (340A assumed peak)

6.4Ah x 3.7V = 23.68Wh capacity
23.68Wh / 14.8V = 1.6Ah available for jump / air
80C x 1.6Ah = 128A continuous output (256A assumed peak)

Hey, maybe the math works out for them to put in higher-quality pouches in 3S than lower-quality in 4S and they can get 100C/200C out of them? That'd give you something around 200A continuous / 400A peak. That's definitely more in line with 3S NOCOs and kind of the bare minimum for a jump starter.

1

-MoistTowelette-

Apr 23, 2026 12:18 PM

944 Comments

Joined Jun 2012

-MoistTowelette-Apr 23, 2026 12:18 PM

944 Posts

Quote from rczrider

:

I'm trying to figure out what's up with this unit. When this was posted, the listing showed 8000mAh capacity. Sometime not long after - and supported by some reviews - the capacity dropped to 6400mAh. The product listing on the LOKITHOR site still shows 8000mAh: https://www.lokithorshop.com/prod...ed-2000ampI'm wondering if they changed their battery from 4S (14.8V) to 3S (11.1V). Several of NOCO's lower models use 3S/11.1V, so it's not inherently bad and really shouldn't be an issue; in fact, it would slightly bump the continuous amperage. If they didn't go from 4S to 3S, then this thing is going to struggle to jump anything that isn't a 4-cylinder in warm weather.8Ah x 3.7V = 29.6Wh capacity29.6Wh / 14.8V = 2Ah available for jump / air80C x 2Ah = 160A continuous output (320A assumed peak)6.4Ah x 3.7V = 23.68Wh capacity23.68Wh / 11.1V = 2.13Ah available for jump / air80C x 2.13Ah = 170A continuous output (340A assumed peak)6.4Ah x 3.7V = 23.68Wh capacity23.68Wh / 14.8V = 1.6Ah available for jump / air80C x 1.6Ah = 128A continuous output (256A assumed peak)Hey, maybe the math works out for them to put in higher-quality pouches in 3S than lower-quality in 4S and they can get 100C/200C out of them? That'd give you something around 200A continuous / 400A peak. That's definitely more in line with 3S NOCOs and kind of the bare minimum for a jump starter.

When I got the battery jumper, it came with a marketing flyer stating 'The Force of Thunder in Hand'. I haven't had to use it yet, but it's nice to know you have the force of thunder available.

LOKITHOR J400 2000A 12V Portable Lithium Jump Starter, Car Battery Booster Pack, USB-C Powerbank Charger, and Jumper Cables for Upto 8.0-Liter Gas and 6.0-Liter Diesel $32.38

$32

$60

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