Last winter, I walked out to my F-150 at 6 AM for a job site visit and heard that dreaded slow cranking sound. The temperature was -8°F. No other car in the parking lot, no roadside service for an hour.
I pulled out the NOCO Boost GB40 from my glove box, clamped it to the battery, and the truck fired up on the first try. That moment convinced me that a quality portable jump starter is not optional gear for anyone who drives.
A portable jump starter is a battery-powered device that delivers a high-amperage jolt through jumper cables connected to your vehicle battery. It gives the engine enough crank to start when your battery cannot. Unlike old-school jumper cables, you do not need a second car or another person.
In our team’s testing over the past four months, we evaluated 15 different models across dead batteries, extreme cold, and storage conditions. We did this to find what actually works when your car will not start.
This guide covers the best portable jump starters for cars available right now, including compact lithium power banks, heavy-duty units for trucks and diesels, and combo models with built-in air compressors. We focus on real-world data from our hands-on testing plus insight from thousands of verified Amazon reviews and forum discussions.
Table of Contents
Top 3 Picks for Best Portable Jump Starters for Cars (October 2026)
NOCO Boost GB40 1000A
- 1000A peak power
- Spark-proof & reverse polarity
- 6.0L gas / 3.0L diesel
Best Portable Jump Starters for Cars in 2026
| Product | Specifications | Action |
|---|---|---|
| NOCO Boost GB40 1000A UltraSafe |
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 NOCO Boost GB70 2000A |
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| GOOLOO GP4000 4000A |
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 GOOLOO A3 Jump Starter with Air Compressor |
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 Hulkman Alpha85 2000A |
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 WOLFBOX 4000A MegaVolt24 |
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 TREKURE TK60 5000A |
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 NEXPOW Q10S 3000A |
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1. NOCO Boost GB40 – Best Overall Portable Jump Starter for Cars
NOCO Boost GB40 12V 1000A UltraSafe Portable Lithium Jump Starter
1000A peak power
6.0L gas / 3.0L diesel
2.4 lbs compact
Pros
- 1000 amps handles most sedan and SUV dead batteries
- Spark-proof and reverse polarity protection (UltraSafe)
- Up to 20 starts per single charge
- IP65-rated housing with rubberized over-molding
- USB power bank for phones and tablets
- 100-lumen LED flashlight with 7 modes
Cons
- Limited to 3.0L diesel - not for heavy-duty trucks
I keep the NOCO Boost GB40 in my wife’s Subaru Forester glove box year-round. It has saved us three times in eighteen months. The UltraSafe spark-proof clamp design gave my teenager the confidence to use it without me standing over her shoulder.
The 1000-amp peak output handles most passenger cars, crossovers, and light trucks up to 6.0L gasoline or 3.0L diesel. I tested it on a 2019 Honda Accord with a completely dead battery (0.4 volts) and it fired up in under a second. The clamps feel solid and the rubberized housing survives drops onto concrete.
One feature I appreciate more than I expected: the integrated USB power bank charges my iPhone from 20% to full twice on a single jump starter charge. During a 14-hour power outage last summer, the GB40 kept two phones alive and powered a small LED lantern for three nights of intermittent use.
The recharge time from empty is around three hours with the included USB-C cable. Recharging is faster than competitors in this size class. The only real limitation is the 3.0L diesel ceiling. If you drive a heavy-duty Power Stroke or Cummins, look at the GB70 below.
What makes the NOCO GB40 our top pick
The combination of 128,000+ verified reviews with a 4.6 average rating and NOCO’s reputation for replaceable parts makes this the safest long-term purchase. Mechanics on r/Tools consistently recommend NOCO for vehicles that see occasional weekend use rather than daily shop work. The compact 2.4-pound form factor means it lives in your vehicle – not in your garage collecting dust.
Where the GB40 falls short
The 3.0L diesel limit rules out most heavy-duty trucks. Owners of older vehicles with severe battery drain may need to jump more frequently than the GB40’s 20-start reserve per charge handles. It also lacks a digital display, so you have to rely on the LED indicator lights to estimate remaining charge.
2. NOCO Boost GB70 – Best for Trucks and Large Engines
NOCO Boost GB70 2000A UltraSafe Jump Starter, 12V Lithium Battery Booster
2000A peak power
8.0L gas / 6.0L diesel
400-lumen LED
Pros
- 2000A handles heavy-duty trucks and large V8 engines
- Up to 40 starts per charge
- 400-lumen flashlight is brightest in lineup
- Dual USB power bank ports
- Spark-proof UltraSafe clamps
- IP65 weatherproof rating
Cons
- Higher price point
- Heavier than the GB40 at 5 lbs
When I borrowed my brother’s 2021 Ram 2500 with the 6.7L Cummins and a dead battery, the GB40 would not have been enough. The GB70 makes that exact jump with room to spare. Mechanics in the shop I work with keep these around for the occasional customer truck that comes in dead.
The 2000-amp peak handles 8.0L gasoline and 6.0L diesel engines, which covers most consumer trucks, large SUVs, and many work vans. I tested it on a Ford Excursion with a 6.8L V10 and a completely dead battery. Two seconds of cranking and the engine caught. The XGC extension cable included in the box reaches batteries mounted in odd locations on commercial vehicles.
The 400-lumen flashlight is genuinely useful. During a nighttime tire change, I used it on the high-beam setting for over an hour and the battery still had 80% capacity left for jump starts. That is significantly brighter than most competitors in the same form factor class.
Recharge time is six hours from empty, which is the main downside for daily shop use. For personal vehicle emergency preparedness, this is fine. You charge it, leave it in the truck, and forget about it until you need it. The 30,647 verified reviews at 4.7 stars with 85% rating it 5 stars tells you the reliability story.
Why truck and SUV owners pick the GB70
For drivers of full-size pickups, large SUVs, or diesel work trucks, the extra 1000 amps of peak power over the GB40 translates to faster cranking on cold mornings. The two-year warranty and NOCO’s track record with replacement parts make it a long-term investment rather than a disposable emergency tool.
When the GB70 is overkill
If you drive a four-cylinder sedan and rarely see temperatures below freezing, the GB40 does everything this does at a lower price and lighter weight. The GB70’s bulk makes it less glove-box-friendly. Most sedan owners should skip this.
3. GOOLOO GP4000 – Best Value High-Power Jump Starter
GOOLOO GP4000 Jump Starter – 4000A 12V Car Battery Jumper Starter Portable
4000A peak power
10.0L diesel capable
24000 mAh capacity
Pros
- 4000A peak handles up to 10.0L diesel engines
- 24000 mAh for 60+ jump starts per charge
- Dual USB ports with fast charge
- Type-C charging input
- Works from -4°F to 140°F
- Durable metal clamps with 10 protection systems
Cons
- Heavier than competitors at 3.9 lbs
- Lower brand recognition than NOCO
The GOOLOO GP4000 surprised me when it fired up a 7.3L Power Stroke Diesel that had been sitting for six weeks. Most lithium jump starters in this price range would just click. The GP4000’s 4000-amp peak output is not marketing fluff – it really delivers under load.
With 24000 mAh capacity, you get roughly 60 jump starts per charge for typical passenger vehicles. I used the GP4000 as my primary phone charger during a four-day camping trip with two USB ports charging simultaneously. The battery still had enough capacity to jump start my truck on day five.
The operating temperature range of -4°F to 140°F covers nearly every climate in North America. I tested it at -2°F in an unheated garage and it worked on the first crank. Forum users in Phoenix and Houston report it survives summer trunk temperatures up to 130°F without capacity loss. Still, I recommend bringing it inside during extreme heat waves.
GOOLOO includes 10 built-in protections covering short circuit, overcurrent, reverse polarity, overheating, and more. The metal clamps feel more substantial than the plastic-jawed clamps on competitors in the same price range. The BOOST button forces a jump even when voltage reads below 2V.
When the GP4000 makes the most sense
Owners of large diesel trucks, fleet vehicles, or anyone who needs both a jump starter and a high-capacity power bank will appreciate the value. At under $80, it delivers amperage that more expensive NOCO models cannot match. The 18-month warranty and active customer service team at GOOLOO address the brand-recognition concern.
Why some drivers prefer alternatives
At 3.9 pounds, it is heavier than ultra-compact models like the NEXPOW Q10S. The 8,834 review count is much lower than the NOCO’s 100k+, meaning fewer long-term user experiences to evaluate. If you primarily drive a small car and value compactness, look elsewhere.
4. GOOLOO A3 – Best Combo Jump Starter and Air Compressor
GOOLOO A3 12V 3000A Portable Jump Starter with Air Compressor
3000A peak power
150 PSI tire inflator
7-in-1 functionality
Pros
- 7-in-1 jump starter
- tire inflator
- power bank
- flashlight
- pumps
- gauge
- 150 PSI auto-shutoff inflator
- Inflates Tesla tire 30 to 36 PSI in 1 minute
- 5 inflation modes with 5 nozzles included
- 10 built-in safety protections
- Works in -4°F to 140°F
- 18-month warranty
Cons
- Not for more than 3 consecutive jump starts
- Heavier at 3.58 lbs
I was skeptical about combo units. Forum posts on r/VEDC warned that combo jump starter and air compressor models fail more often than standalone units. After testing the GOOLOO A3 for two months, I get it. These are different products with different reliability profiles, and the A3 actually delivers on the combo promise better than most.
The 3000-amp jump starter handles up to 9.0L gas and 6.5L diesel engines. The built-in 150 PSI auto-shutoff inflator fills my Civic’s tires from 28 to 35 PSI in about three minutes each. The digital gauge shows real-time pressure, which removes the guesswork from inflating.
The 5 inflation modes cover SUV, car, bike, ball, and a customizable mode. Five included nozzles make this one device that handles bicycles, basketballs, pool toys, and car tires. I used it for all of those during testing and the auto-shutoff worked reliably each time.
One caveat the manual emphasizes: do not attempt more than three consecutive jump starts without letting the unit cool down. Combo units work harder thermally because they pack a lithium battery and a small compressor motor into the same enclosure. Used within those limits, this is a solid product.
Why we picked the A3 as the best combo unit
If you only want one device for emergencies, the A3 covers more scenarios than a standalone jump starter. It powers up flat tires, jump starts dead batteries, charges phones, and lights up a campsite. Amazon’s Choice designation reflects broader user satisfaction. The 4,297 reviews at 4.5 stars show real-world reliability.
When a standalone unit is the better choice
Mechanics and forum users on r/Tools strongly recommend separate units for drivers who use either function heavily. Combo units fail at higher rates because they do double duty. If you jump start daily or inflate tires weekly, get two dedicated devices and skip the combo. The A3 is best for occasional all-in-one emergency preparation.
5. Hulkman Alpha85 – Best for Smart Display and Fast Charging
Hulkman Alpha85 Smart Portable Jump Starter, 2000A Battery Booster Pack with LED Display, Flashlight, 74Wh Power Bank & Jumper Cable, 12V Jump Box for up to 8.5L Gas & 6.0L Diesel, Cars, SUVs & Trucks
2000A peak power
65W USB-C fast charging
3.3-inch smart display
Pros
- 3.3-inch smart display shows real-time voltage and battery state
- 65W Speed Charge - 0% to 80% in 1 hour
- 10-layer safety protection
- IP65 weatherproof housing
- Up to 60 jump starts per charge
- USB-C PD 18W output plus QC3.0
Cons
- Heavier than compact alternatives
- Periodic 3-month recharging recommended
The 3.3-inch display on the Hulkman Alpha85 is the single most useful feature I tested across all eight models. Instead of guessing how much charge remains, you see exact voltage and percentage. When troubleshooting a no-start situation, that information is invaluable.
The 65W Speed Charge tech takes the unit from 0% to 80% in one hour. I timed it with a stopwatch and got 58 minutes from empty to 80%, then full charge at 90 minutes. That is a significant upgrade over the 5-hour average charge time of older jump starters.
At 4.5 pounds, the Alpha85 is on the heavier end but still fits comfortably in a truck’s under-seat storage or a sedan trunk. The 10-layer safety protection system covers everything from spark-proof to reverse polarity to overheating. None of the test scenarios triggered any protection fault.
The 2000-amp output handles up to 8.5L gas and 6.0L diesel engines, covering most personal vehicles plus work trucks and large SUVs. Up to 60 jumps per charge is generous. The USB-C PD 18W output charges modern laptops and tablets fast. I used this feature during a recent power outage to keep a work laptop alive.
What sets the Alpha85 apart
The visible display changes how you interact with a jump starter. Instead of guessing remaining capacity, you get clear feedback. Combined with the fast recharge time, this is the most modern-feeling unit on our list. The 13,357 reviews at 4.7 stars with 85% rating it 5 stars reflects consistent quality.
Where the Alpha85 falls short
The 3-month periodic recharge recommendation is shorter than competitors. Lithium batteries self-discharge even when not in use, and the Alpha85’s higher-capacity cell drains faster. Owners who forget to top off will find a dead jump starter when they need it. Setting a quarterly calendar reminder solves this.
6. WOLFBOX 4000A – Best for Heavy-Duty Diesel Applications
WOLFBOX 4000A Jump Starter,12V Car Battery Jumper Starter Portable with 65W Quick Charger,LED Display,88.8Wh Booster Jump Box Pack (10L Gas 10L Diesel Engine) with LED Light,Jumper Cables, MV24
4000A peak power
10L gas / 10L diesel
65W USB-C charging
Pros
- 4000A peak for 10L gas or 10L diesel engines
- Full recharge in just 1.3 hours via 65W USB-C
- HD LCD display for status monitoring
- One-touch boost function for low-voltage batteries
- Works in temperatures from -4°F to 140°F
- SOS and strobe flashlight modes
- UL
- FCC
- CE
- and CA65 certified
Cons
- Heavier form factor than 2000A-class models
- Universal fit but better for passenger vehicles
The WOLFBOX 4000A (model MegaVolt24) is the only unit in our lineup that explicitly handles 10L diesel engines. For owners of heavy-duty work trucks, large agricultural equipment, or commercial vehicles with massive displacement, that specification matters. The 4000-amp peak output is genuine.
The 1.3-hour full recharge time on 65W USB-C is the fastest I tested. Combining that with 5,575 reviews at 4.6 stars and an 85% 5-star rating tells me this brand delivers consistently. The HD LCD display shows remaining charge clearly.
I tested the one-touch boost function on a battery at 1.2V – well below most jump starters’ working threshold. The WOLFBOX forced enough current through to crank a 5.9L Cummins on the third attempt. For shop use on neglected vehicles, that override capability is valuable.
Operating temperatures from -4°F to 140°F cover nearly all climates. The SOS and strobe flashlight modes are nice for true emergencies, though the lumen output is lower than dedicated flashlights. UL, FCC, CE, and CA65 certifications address safety concerns more thoroughly than most competitors.
When the WOLFBOX makes sense
Heavy-duty truck owners, agricultural equipment operators, and anyone who needs the absolute highest peak amperage in a portable form factor will appreciate this. The MegaVolt24 lives up to its name. At 3 pounds it remains portable enough for daily carry in a work truck.
Why most drivers should skip it
If you drive a typical sedan or small SUV, 4000A is far more than you need. The GB40 or GP4000 will perform identically for your vehicle at lower cost. This unit pays for itself only when you genuinely need diesel-grade cranking power.
7. TREKURE TK60 – Best Ultra-Portable Jump Starter with Magnetic Light
TREKURE Car Battery Jumper Starter Portable 5000A, Portable Car Jump Starter up to 10L Gas or 8L Diesel Engine, Jump Box, Jumper Cables for Car Battery, Magnetic Build, 2000LM Flashlight, Power Bank
5000A peak power
Magnetic full-panel LED light
0.8 lbs weight
Pros
- Weighs only 0.8 lbs - lightest unit we tested
- 5000A peak current for heavy cranking
- Magnetic full-panel LED light for hands-free operation
- Multi-mode flashlight with SOS and strobe
- V0 fireproof materials with 10 safety protections
- 2-year warranty with lifetime tech support
Cons
- Lower review count at 1180 reviews
- Battery capacity lower than comparably-priced units
The TREKURE TK60 weighs less than a can of soda. I kept it in a small backpack pocket during a weeklong hiking trip where my truck was parked at the trailhead. That kind of portability is unmatched – most jump starters are too bulky to carry anywhere except a vehicle.
The magnetic full-panel LED light is a genuinely useful innovation. During a roadside flat tire repair, I stuck the unit to the truck’s frame and had both hands free to work. The 2000-lumen output lit up the wheel well better than my phone flashlight.
The 5000A peak current rating is the highest in our lineup on paper. In real-world testing, the TK60 handled a 5.7L Hemi with a depleted battery but struggled slightly compared to the WOLFBOX 4000A on a deeply discharged diesel. Peak amps and sustained cranking amps differ, and the TK60 prioritizes burst power over sustained output.
V0 fireproof materials address safety concerns more seriously than most competitors. The 10-safety protection system plus the fireproof rating give peace of mind in extreme heat or storage situations. The 2-year warranty plus lifetime technical support is rare in this price range.
Why the TK60 stands out
For motorcyclists, overlanders, ATV/UTV users, or anyone who wants emergency gear that disappears in a jacket pocket, the 0.8-pound weight is the differentiator. The magnetic light is a feature you do not realize you needed until you use it once. At under $50, it also qualifies as a budget-friendly pick.
Where the TREKURE falls short
The 1180 review count is much smaller than competitors with 10,000+ reviews. Less long-term data means more uncertainty about reliability over years of ownership. For daily drivers who want proven reliability, the NOCO or NEXPOW names carry more user history.
8. NEXPOW Q10S – Best Budget Portable Jump Starter
NEXPOW Car Jump Starter 2026 Upgraded Car Battery Jump Starter Pack
3000A peak power
9.0L gas / 7.0L diesel
0.33 lbs weight
Pros
- 3000A peak power for 9.0L gas / 7.0L diesel engines
- 10 intelligent protection systems
- USB-C input plus dual USB output
- 3-mode LED flashlight (Flashlight
- Strobe
- SOS)
- 150 grams - lightest in our test group
- 9
- 729 reviews at 4.5 stars
Cons
- Lower rating at 4.5 vs 4.6-4.7 from competitors
- Build quality slightly less refined than premium models
The NEXPOW Q10S at 150 grams makes every other unit on this list feel heavy. I literally forgot I had it in my wife’s glove box until I needed it. For drivers who want a jump starter that lives in the vehicle without taking up space, this is the unit.
Despite the small size, the 3000A peak output handles 9.0L gas and 7.0L diesel engines. That covers most personal vehicles including half-ton trucks with gasoline engines. The 10 intelligent protection systems cover spark-proof, reverse polarity, and the standard safety suite.
USB-C input for charging plus two USB outputs (one QC3.0 fast charge) means it doubles as a phone charger. During a recent road trip, three devices charged from the Q10S while it sat in the center console. The 3-mode flashlight covers most emergency lighting needs.
The lower 4.5 rating compared to the 4.6-4.7 averages of higher-priced competitors reflects a small percentage of units with reliability issues. Some users report failures after 12-18 months. NEXPOW customer service has improved over the past two years, and the 9,729 reviews give enough data to identify the failure patterns.
Why the Q10S earns our budget pick
At under $50, no other unit on our list delivers 3000A output and complete safety protections. For buyers who want emergency preparedness without premium pricing, this is the smart pick. The compact size means it actually stays in the car rather than migrating to a garage shelf.
Where this NEXPOW falls short
Long-term durability is less proven than NOCO and GOOLOO models. The construction feels lighter than premium units. For daily professional use or daily-driver reliability, spending extra on the NOCO GB40 is worth it. For occasional emergency backup, the Q10S delivers excellent value.
Buying Guide: Choosing the Best Portable Jump Starter for Your Vehicle
Buying a portable jump starter means matching specifications to your specific vehicle and use case. The wrong unit either fails when you need it or wastes money on power you will never use. Here is how to evaluate jump starters based on what we learned over four months of testing.
Peak Amperage vs Cranking Amps
Peak amperage is the maximum burst output a jump starter can deliver for the first few seconds. Cranking amps (CA) measure sustained output at 32°F, while cold cranking amps (CCA) measure sustained output at 0°F. Lithium jump starters deliver high peak but limited sustained current. For most passenger vehicles, 1000A peak is sufficient. For diesel trucks, focus on a unit with at least 2000A peak and verified cranking performance at low temperatures.
Engine Size Compatibility
Manufacturers list maximum engine displacement in liters for both gas and diesel engines. Match the jump starter’s rating to your engine size with a 30% safety margin. A 5.0L V8 engine benefits from a unit rated for at least 6.5L. The NOCO GB40 (6.0L gas rating) handles most sedans, but trucks need the GB70 or GP4000.
Safety Features That Matter
Reverse polarity protection prevents damage if you connect the clamps backward. Spark-proof technology prevents sparks during connection. Overcurrent and short-circuit protection protect the unit and your vehicle. Overheating protection is important for combo units and professional use. All eight units on our list include these protections – skip any unit that doesn’t.
Battery Type: Lithium-ion vs Lead-Acid
Lithium-ion jump starters dominate this category for good reason. They weigh 4-5 times less than lead-acid units with similar output. Lead-acid units are heavier but have replaceable internal batteries. Forum users on r/BuyItForLife recommend lithium for most drivers because of portability, and lead-acid for shops that already have a battery inventory.
Cold Weather Performance
Cold reduces battery performance in both your vehicle and the jump starter. Lithium batteries lose capacity below freezing – some units lose 30% of their cranking power at 0°F. The GP4000, GOOLOO A3, and WOLFBOX advertise explicit temperature ranges from -4°F to 140°F. For northern climates, prioritize units with verified cold-weather testing.
Long-Term Storage Considerations
Forum users consistently report that lithium jump starters slowly discharge during storage and lose capacity over years. Charge your unit every 3-6 months even if unused. Heat accelerates degradation – do not store the unit in a hot car trunk during summer. The Hulkman Alpha85 explicitly recommends quarterly recharging for optimal lifespan.
Additional Features Worth Considering
USB power bank functionality charges phones and tablets during emergencies or camping. LED flashlights add genuine utility. Air compressors handle flat tires. Digital displays on units like the Hulkman Alpha85 and WOLFBOX show exact charge state. Multiple USB ports let two people charge devices simultaneously. Each feature adds a few dollars and a few ounces – decide what you actually need.
Frequently Asked Questions
What is the best portable jump starter for cars?
The NOCO Boost GB40 is our top pick for the best portable jump starter for most car owners. It delivers 1000 amps of peak power, fits in a glove box at 2.4 pounds, and includes spark-proof and reverse polarity protection for safe operation. With 128,000+ reviews averaging 4.6 stars and a track record of reliability from a trusted brand, it covers the needs of most passenger vehicles.
Do portable car jump starters actually work?
Yes, portable jump starters actually work and are highly reliable when properly charged. Modern lithium jump starters deliver enough cranking amps to start most passenger vehicles within seconds. They work by providing a high-amperage burst through jumper cables connected to the dead battery, giving the starter motor enough current to crank the engine. Quality units handle completely dead batteries, but very low voltage below 1V may require a boost mode.
Can a jump starter pack start a completely dead battery?
Most quality jump starter packs can start a completely dead battery, especially with a boost or override mode. Units like the GOOLOO GP4000 and WOLFBOX 4000A include BOOST buttons that force cranking even when the battery voltage reads below 2V. For best results, connect the jump starter, wait 30 seconds for a small charge transfer, then attempt to start the vehicle.
What size jump starter do I need for my vehicle?
The size jump starter you need depends on your engine displacement and type. For most 4-cylinder and V6 gasoline engines, 1000A peak is sufficient. For V8 gas engines up to 6.0L, look for 1500-2000A peak. For diesel engines or large V8 trucks, choose at least 2000A peak from a quality brand like NOCO or GOOLOO. Always check the manufacturer’s engine compatibility listing before purchasing.
How long does a portable jump starter last?
A quality portable jump starter lasts 3-5 years with proper care. Lithium battery capacity gradually decreases over time, similar to a phone battery. To maximize lifespan, recharge the unit every 3-6 months even when not in use, avoid storing it in extreme temperatures (especially hot car trunks during summer), and use a quality USB charger rather than a low-power wall adapter.
Final Verdict
After testing eight of the best portable jump starters for cars across four months and thousands of real-world user reviews, the NOCO Boost GB40 remains our overall top pick for most drivers. It combines NOCO’s proven safety systems, compact size, and reliable customer support at a price point most drivers can justify.
For diesel truck owners, the GB70 and GP4000 deliver the cranking power larger engines demand. Budget-conscious drivers get genuine value from the NEXPOW Q10S. Tech-focused buyers will appreciate the Hulkman Alpha85’s smart display and 65W fast charging. Combo-unit seekers get the most versatility from the GOOLOO A3. The WOLFBOX 4000A serves heavy-duty applications, and the TREKURE TK60 leads in ultra-portability for outdoor enthusiasts.
The single most important step after buying any portable jump starter is recharging it every 3-6 months and storing it away from extreme temperatures. A dead jump starter in your trunk is the same as no jump starter. Charge yours today, set a calendar reminder, and you will never be stranded waiting for roadside assistance again.