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  • 48
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Answer:
I guess I'm the outlier here, my b7 RS4's battery died the other day because I'm an idiot and left the parking lights on while checking them. First attempt I left it on a good 10-15 seconds before attempting to start, I got one crank attempt out of the jump pack and it was fully charged, almost started, but it sucked t… see more I guess I'm the outlier here, my b7 RS4's battery died the other day because I'm an idiot and left the parking lights on while checking them. First attempt I left it on a good 10-15 seconds before attempting to start, I got one crank attempt out of the jump pack and it was fully charged, almost started, but it sucked the jump pack dry in that one attempt...recharged the jump pack and had another go, got it started with half jump pack left with only 1 attempt. Maybe it's the high compression ratio of that 4.2, maybe it was all 20 million computers that were also trying to fire up...maybe with my bad luck I have a bad jump pack, Idk, but that was my experience using it on a v8. I wouldn't even think of trying to start my 6.5 Detroit diesel with it, lol.... see less I guess I'm the outlier here, my b7 RS4's battery died the other day because I'm an idiot and left the parking lights on while checking them. First attempt I left it on a good 10-15 seconds before attempting to start, I got one crank attempt out of the jump pack and it was fully charged, almost started, but it sucked the jump pack dry in that one attempt...recharged the jump pack and had another go, got it started with half jump pack left with only 1 attempt. Maybe it's the high compression ratio of that 4.2, maybe it was all 20 million computers that were also trying to fire up...maybe with my bad luck I have a bad jump pack, Idk, but that was my experience using it on a v8. I wouldn't even think of trying to start my 6.5 Detroit diesel with it, lol....
Amazon Customer
· July 25, 2020
  • 25
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I found this on the NOCO faq page....
What types of batteries can Boost jump?
All Boost models (except the GB500 Boost Max) can jump start 12V lead acid batteries only. This includes wet, gel, maintenance free, enhanced flooded battery, and absorbent glass mat batteries. The GB500 Boost Max is capable of jump startin… see more
I found this on the NOCO faq page....
What types of batteries can Boost jump?
All Boost models (except the GB500 Boost Max) can jump start 12V lead acid batteries only. This includes wet, gel, maintenance free, enhanced flooded battery, and absorbent glass mat batteries. The GB500 Boost Max is capable of jump starting 12V and 24V acid batteries. see less
I found this on the NOCO faq page....
What types of batteries can Boost jump?
All Boost models (except the GB500 Boost Max) can jump start 12V lead acid batteries only. This includes wet, gel, maintenance free, enhanced flooded battery, and absorbent glass mat batteries. The GB500 Boost Max is capable of jump starting 12V and 24V acid batteries.

Kendal Irwin
· April 11, 2020
  • 11
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It will hold 75% of each charge for a year or longer but we recommend topping it off every 6 mo if it hasn't been used, just to make sure it is fully charged if needed.
NOCO Support
Manufacturer · September 21, 2017
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Whatever the safe range of storage temperatures is for these units, you'll be asking for trouble by leaving it in a hot vehicle, period. Batteries simply arent designed to survive such conditions very well. No type or design of battery is. In fact, Im willing to bet that most of the negative reviews from people who … see more Whatever the safe range of storage temperatures is for these units, you'll be asking for trouble by leaving it in a hot vehicle, period. Batteries simply arent designed to survive such conditions very well. No type or design of battery is. In fact, Im willing to bet that most of the negative reviews from people who said that their Noco jumper swelled up and split apart were from people who kept their Noco jumpers stored in hot cars most or all of the time. Use some common sense folks! No battery is going to survive being stored in a hot car all the time. The lead acid battery that starts your car does alright(for the most part) because its under the hood and well ventilated. Heat doesnt build up under the hood of a non running car like it does in the interior of a car that's sitting in full sunlight with its windows rolled up. Its the same reason that you dont lock a kid or dog up in your car in the heat. Think about it.... see less Whatever the safe range of storage temperatures is for these units, you'll be asking for trouble by leaving it in a hot vehicle, period. Batteries simply arent designed to survive such conditions very well. No type or design of battery is. In fact, Im willing to bet that most of the negative reviews from people who said that their Noco jumper swelled up and split apart were from people who kept their Noco jumpers stored in hot cars most or all of the time. Use some common sense folks! No battery is going to survive being stored in a hot car all the time. The lead acid battery that starts your car does alright(for the most part) because its under the hood and well ventilated. Heat doesnt build up under the hood of a non running car like it does in the interior of a car that's sitting in full sunlight with its windows rolled up. Its the same reason that you dont lock a kid or dog up in your car in the heat. Think about it....
TirraTop Contributor: Archery
· December 26, 2018
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Initially you need to charge it for about 24 hours. After the initial charge you can use several times before you need to charge it.
why did this person charge the GB40 24 hours? After it is fully charged you should have 2 red one yellow and green meaning its fully charged Correct . This took me about 3 hours not 24

Donna Muller
· July 4, 2018
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Yes. The GB40 is FAA compliant and can be taken on a plane, however they have to be in your carry-on. No-Lithium batteries are allowed to be checked in luggage.The GB40 is under 100Wh which is the limit set by the FAA. For more additional information, or for current updates, please see the link below to the FAA guideli… see more Yes. The GB40 is FAA compliant and can be taken on a plane, however they have to be in your carry-on. No-Lithium batteries are allowed to be checked in luggage.The GB40 is under 100Wh which is the limit set by the FAA. For more additional information, or for current updates, please see the link below to the FAA guidelines.
https://www.faa.gov/about/initiatives/hazmat_safety/more_info/?hazmat=7 see less
Yes. The GB40 is FAA compliant and can be taken on a plane, however they have to be in your carry-on. No-Lithium batteries are allowed to be checked in luggage.The GB40 is under 100Wh which is the limit set by the FAA. For more additional information, or for current updates, please see the link below to the FAA guidelines.
https://www.faa.gov/about/initiatives/hazmat_safety/more_info/?hazmat=7

NOCO Support Team
Manufacturer · February 17, 2017
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This is not a charger, it is a jump starter, and you do not need to hurry to remove the clamps on any jump starter.
Josh Wobbles
· March 13, 2017
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I was wondering this too, and just can't imagine why it wouldn't. I mean, you have a dead battery, no lights or anything. You clamp this onto your battery, push the button, and now you have lights. Then you go crank the starter and it starts. But what if you don't crank it and just let it sit. Wouldn't the lights burn… see more I was wondering this too, and just can't imagine why it wouldn't. I mean, you have a dead battery, no lights or anything. You clamp this onto your battery, push the button, and now you have lights. Then you go crank the starter and it starts. But what if you don't crank it and just let it sit. Wouldn't the lights burn until this unit goes dead? Or if the lights aren't burning, wouldn't this slowly charge your battery until either your battery is charged, or until this drops in voltage to a point that's equal to the now partially charged battery?
And if for some reason the clamps wouldn't allow this and instead you use the 12V 15A output into your cigarette lighter. Wouldn't this do as I described above also? Maybe I'm wrong, and maybe I'm not taking into account that a car battery is actually a bit over 14V, and this unit is 12V, but still I would guess this would bring your battery up at least half-way.
Perhaps an electrical engineer can set us straight? see less
I was wondering this too, and just can't imagine why it wouldn't. I mean, you have a dead battery, no lights or anything. You clamp this onto your battery, push the button, and now you have lights. Then you go crank the starter and it starts. But what if you don't crank it and just let it sit. Wouldn't the lights burn until this unit goes dead? Or if the lights aren't burning, wouldn't this slowly charge your battery until either your battery is charged, or until this drops in voltage to a point that's equal to the now partially charged battery?
And if for some reason the clamps wouldn't allow this and instead you use the 12V 15A output into your cigarette lighter. Wouldn't this do as I described above also? Maybe I'm wrong, and maybe I'm not taking into account that a car battery is actually a bit over 14V, and this unit is 12V, but still I would guess this would bring your battery up at least half-way.
Perhaps an electrical engineer can set us straight?

J. Tiedman
· September 16, 2017
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Nope. Can only charge usb devices.
Nick Lev
· December 16, 2016
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I live in Central Kentucky where we get all kinds of weather.. 100 degrees down -10 most every year. Mine has performed in all kinds of weather. Just last week I used it to start a friend's car. It had been in the floor of my pickup for 6 months. Turned over a big Lexus engine with little effort.
J. Blankenship
· December 7, 2018