NOCO Ultra Safe Portable Car Battery Charger

Last updated date: August 2, 2022

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NOCO Ultra Safe Portable Car Battery Charger

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We looked at the top Car Battery Chargers and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Car Battery Charger you should buy.

Update as August 2, 2022:
Checkout Stay On The Road With The Best Car Battery Charger for a detailed review of all the top car battery chargers.

Overall Take

Ultra-portable, this lightweight device lets you jump start everything from a car or tractor to a laptop or phone. When not in use, plug it into any 12V cigarette lighter to make sure it's ready next time you need it. In addition, it features an integrated LED flashlight with seven modes, including emergency strobe and SOS.

In our analysis of 165 expert reviews, the NOCO Ultra Safe Portable Car Battery Charger placed 1st when we looked at the top 17 products in the category. For the full ranking, see below.

From The Manufacturer

The GB40 is an ultra-portable, lightweight and compact lithium-ion jump starter for 12-volt batteries. With it, you can safely jump start a dead battery in seconds – up to 20 times on a single charge. It’s mistake-proof, making it safe for anyone to use and features spark-proof technology, as well as reverse polarity protection. The GB40 lithium jump starter integrates with a high-output 100 lumen LED flashlight with 7 light modes. including low, medium, high, flashing, strobe and emergency SOS. It can hold its charge for up to one-year without being recharged. Its internal battery can be used to recharge any personal mobile devices like smartphones, tablets or any other USB device, can be recharged by any powered USB port, and holds its charge for up to one-year. It’s rated at 1000 Amps, and suitable for use on gasoline engines up to 6 Liters and diesel engines up to 3 Liters, such as a car, boat, lawn mower and more. Included is the GB40, HD battery clamps, USB charging cable, USB car charger, microfiber storage bag, and a 1-Year Hassle-Free Limited , plus Free Lifetime Customer Support.

Expert Reviews

Expert Summarized Score

15 expert reviews

User Summarized Score

5,637 user reviews

What experts liked

There is a patented spark-proof technology keeping both GB40 and your car battery safe at all times during use. The reverse polarity protection ensures that users will always know how to attach the device to the jump leads.
- Tool Nerds
The GB40’s USB charging capability makes it a great tool to have in your glove box. It only weighs around 2 pounds, so you can take it anywhere and charge your phone, tablet or any other device that uses a USB charger.
- Top Ten Reviews
July 31, 2017 | Full review
Built-in 100-lumen LED flashlight with emergency signal modes
- Battery Focus
Its lithium ion battery system can hold a charge that is worth 20 jumpstarts while also powering an integrated 100-lumen ultra bright flashlight that comes with 7 different light mode. This includes an emergency strobes and SOS light among others
- Car Bibles
The NOCO Genius Boost Plus GB40 jump starter delivers just the right amount of power to start your car again. The booster has special technology that ensures it won’t cause sparks. It also offers reverse polarity protection to deliver a safe connection.
- Business Insider
It has a safe and mistake-proof design with spark-proof technology and reverses polarity protection, which allows it to safely connect to any battery.
- Car Outfitter
When it comes to safety, this one has that reverse polarity feature so you will know if you connected the right plugs.
- CarUnderstanding
Using advanced Spark-Proof technology and Reverse Polarity this device offers high-security features. If you accidentally make a mistake nothing will happen, not a single spark will appear. These safety precautions make GB40 very safe to use even for persons who are not familiar with these kinds of devices. His durable plastic housing makes it hard to brake or damage.
- Mini Thunder
July 28, 2015 | Full review
The ease and portability of the NOCO Genius Boost eliminate the need to park one vehicle next to another as well as eliminating other hassles associated with running cables.
- Trail4Runner
January 28, 2019 | Full review
The NOCO Genius Boost plus GB40 1000 Amp 12V Ultra Safe Lithium Jump Starter is equipped with the spark proof technology that saves you from the worry of getting a fire or some other issue.
- Car Diagnosing
A great design on the display with clear indicators and labels
- Jump Starter Reviews
It can be used to jump start gas engines up to 6 liters and diesel engines up to 4 liters in displacement. This is enough for most cars and most smaller fishing and leisure boats.
- Deep Cycle Marine Battery
It is has a compact build with a yet powerful 1,000 amp lithium-ion jump starter that delivers 7,000 joules of starting power.
- Auto Parts U
March 31, 2017 | Full review
Safety design with spark-proof technology and protection from reverse polarity.
- OBD Advisor
It prevents charging at incorrect polarity connection and lets out no sparks at all. For other devices, it can work as a power source through two USB ports and two 12V outlets.
- Best For Driver

What experts didn't like

Won’t start engines as reliably in cold weather
- Battery Focus
Cannot charge the GB40 from a wall outlet without buying an adapter,
- Business Insider
Not good for cold weather.
- CarUnderstanding
We found user manual a bit hard to read and for sure it would be great if it came with some self-contained box.
- Mini Thunder
July 28, 2015 | Full review
The connection from the terminals could be confusing at times
- Car Diagnosing
There isn't enough of a charge for a larger cars and machinery
- Jump Starter Reviews
Relatively low battery capacity.
- OBD Advisor
The build is plastic – not solid enough.
- Best For Driver

Our Expert Consultant

Vicki Liston 
Home Improvement Expert

Vicki Liston writes, produces, and narrates “On The Fly…DIY,” an award-winning home improvement and DIY show of unique project tutorials for the casual DIY’er.

Home improvement and all things DIY have been Liston’s passion since she bought her first house in 2007 and she started making video blogs in 2014. She’s performed hundreds of DIY projects, from small ones to major, wall-smashing renovations and can teach you how to make a trendy DIY barn door for cheap. The proceeds earned from “On The Fly…DIY” are donated to no-kill animal shelters and rescue organizations. You can find her show on Prime Video.

An Overview On Car Battery Chargers

A car battery charger is one of those things you might not think about buying until you need it, but then you will wish you had the foresight to purchase one in advance. Choosing the right vehicle battery jumper or charger device depends on several factors unique to your situation.

The primary consideration to determine is what type of car battery charger will best suit your needs.

Vicki Liston is the writer, producer and narrator of “On The Fly…DIY,” an award-winning home improvement and DIY show of unique project tutorials for the casual DIY’er.

“There are two basic types of car battery chargers: trickle and smart (also called multi-step) chargers,” shares Liston. “I don’t consider the float chargers to be actual ‘chargers,’ as they won’t resurrect a dead battery and are only used to maintain the charge.”

Learning the pros, cons and capabilities of a car battery charger type is helpful in the decision-making process.

“Trickle chargers are the most inexpensive,” Liston says, “but they are also the slowest.”

While this might seem like a downfall, it can be an advantage in certain situations.

“If you aren’t in a major rush to recharge, a trickle unit will serve you well,” explains Liston. “It’s actually better for the battery to charge slower than faster as a fast charge can generate a lot of heat and damage the battery.”

If safety is top of mind, a smart charger might be a better choice.

“Smart or multi-step chargers employ the use of a microprocessor to assess the battery and make automatic decisions about how to charge. The standard versions have the automatic stop feature to avoid overcharging, damage, and explosions,” Liston points out. “They can also detect if you’ve accidentally connected the cables to the wrong terminals, called ‘reverse polarity protection.’ A trickle charger will ruin a battery if connected incorrectly while a smart charger just won’t begin to charge at all. Understandably, these are the more expensive option, but they are also the safest.”

Be sure to check the amp rating on a potential car battery charger, as this will let you know how quickly it will charge your battery.

“Trickle chargers are rated at below one amp so it may take a few days to fully charge a battery,”  Liston says. “Again, slower is better for the battery, but you might not have the luxury of waiting around that long and need it up and running in a hurry.

“Higher rated chargers can run around 20 amps and the emergency ‘get this thing started NOW’ type chargers can crank out 40 amps to get you on the road in a hot minute,” continues Liston. “Some smart chargers allow you to choose a recharge setting based on your circumstances. You can set it lower when you have the time to wait and it won’t expend unnecessary, damaging heat. Set it higher only when the occasion calls for speed. You’ll have the best of both worlds in one charger.”

The Car Battery Charger Buying Guide

  • If you decide on a trickle car battery charger, Liston highly recommends an advanced model to ensure the safest operation possible. “The lower end models should not be ‘attached and forgotten’ as they will not stop charging when the battery has reached maximum capacity,” advises Liston. “Because of this, they run the risk of overcharging and even causing an explosion. The higher-end models, usually referred to as advanced trickle chargers, can detect when a battery is fully charged and either stop or automatically switch over to ‘float’ mode to maintain the charge. “
  • Since you should always put safety first, the right clamps are essential. “Whether you go with a trickle or a smart charger, I highly recommend looking for a model with spark-proof clamps,” Liston notes. “Sparks can not only damage both the charger and the battery but they can cause fires so this safety feature should be a must.”
  • “If you are only looking to keep a car battery charged, opt for a 12-volt only model,” suggests Liston. “However, if you’ve got other types of battery-operated vehicles, such as an ATV, boat, jet ski, riding lawn mower, or golf cart, you might want to consider a 6/12 or a 12/24 volt charger. This will allow you to use your charger in multiple applications instead of having a different charger for each volt size. 6/12/24 chargers are commercially available however they are extremely expensive and it’s cheaper to own both a 6/12 and a 12/24 than one 6/12/24 version.”