Portable car battery jump starters are must-have devices for any driver. These compact tools allow you to start a dead battery without requiring another vehicle or external power source. This guide covers everything you need to know about choosing, using, and maintaining portable jump starters.
What Are Portable Jump Starters?
A portable jump starter is a device that contains its own battery and cables to connect to a vehicle’s battery terminals. This allows you to “jump start” a car with a dead battery by delivering enough power to the battery to start the engine.
Jump starters provide a convenient way to start your car anywhere, without relying on access to another vehicle for a jump. Their compact size also makes them easy to store in your vehicle’s trunk or glove compartment so they’re handy in an emergency.
Key Features
- Internal battery — Typically lithium-ion or lead-acid, which provides the power to jump start a vehicle. More power equals more jump starts per charge.
- Cables — Heavy duty cables with clamps to attach to battery terminals. Cable length can range from 2–20 feet.
- Peak amps — The maximum amperage the device can provide for short bursts when starting. More is better for larger engines.
- Safety features — Reverse polarity warning, spark protection, auto shut off.
- Portability — Compact sizes around 10 x 5 x 5 inches. Weights 2–20 pounds.
Benefits of Portable Jump Starters
Using a jump starter has a number of advantages over jumper cables connected to another vehicle:
Convenience
You can start your car battery wherever you are, without relying on another vehicle being available. Storing one in your car means help is always at hand.
Compact Size
Jump starters are small enough to keep in your trunk, glovebox, or even backpack. Jumper cables require another vehicle.
Multi-Use
Many jump starter models can charge phones, tablets, and other USB devices in addition to jump starting cars.
Independence
You don’t have to wait for another person to help you with jumper cables. Quickly jump start yourself.
Safety
Jump starters include safety features like reverse polarity protection. Battery explosions are a risk when improperly connecting jumper cables.
What to Look for When Buying a Jump Starter
There are a few key factors to consider when choosing a portable jump starter:
Peak Amps
Peak amps relate to the maximum amount of power the jump starter can provide. This determines how large of an engine it can start. More peak amps enable starting larger, fully drained batteries.
- Small size jump starters range from 300–1000 peak amps, good for 4–6 cylinder engines.
- Medium units go up to 2000 peak amps for larger vehicles and trucks.
- Heavy duty options over 3000 peak amps can jump start tractors and large diesel engines.
Battery Capacity
Battery capacity determines how many jumps you can do per charge. Larger batteries allow more jump starts between charges. Look for 10–30 jumps from a single charge.
Cable Length
Longer cables give you more flexibility on where you can place the jump starter relative to the car battery. 10–20 foot cables are ideal to easily reach batteries under the hood or trunk.
Safety Features
Reverse polarity warning alerts you if incorrectly connected. Auto shutoff turns the unit off after a set time to prevent overcharging. Over-voltage protection prevents damage to the car’s electrical system.
Types of Jump Starter Batteries
There are three main types of internal batteries used in portable jump starters:
Lithium Ion
- Most popular type due to light weight and compact size.
- Hold a charge for many months when not in use.
- Charge fully in 2–3 hours.
- Can provide hundreds of jumps per battery lifespan.
- More expensive but longer lasting.
Lead-Acid
- Traditional battery type, heavier but more affordable.
- Can’t hold a charge as long — needs recharging every 30–60 days.
- Provide around 100 jump starts when well maintained.
- Takes 8–12 hours to fully recharge after use.
Ultracapacitors
- Newer battery technology charges in seconds.
- No chemical reactions so can charge thousands of times.
- Downside is high self-discharge — loose charge in days/weeks.
- More expensive currently.
- Best for frequent quick charging needs.
Top Portable Jump Starter Models
NOCO Boost Plus GB40
- Up to 20 jump starts on a single charge.
- 1000 peak amps from compact lithium battery.
- Spark proof technology.
- 10 foot cables.
- Multi-function for phone charging etc.
- Around 1.2 pounds.
Stanley J509
- 500 instant starting amps, 1000 peak amps.
- Built in 120 PSI air compressor for tire inflation.
- Heavy duty clamps with reverse polarity alarm.
- LED light and USB port.
- 8 foot cables.
Clore Automotive JNC660
- 1700 peak amps, 425 cranking amps.
- Heavy duty lead-acid battery.
- Full sized jumper clamps for diesel trucks.
- Built-in charger and hazard light when in use.
- 20 foot cable length.
Avapow Lithium Car Jump Starter
- 2000 peak amps can start 8L gas or 6L diesel engines.
- Portable and compact at 1lb 7oz.
- Safely jump starts up to 30 times per charge.
- Intelligent clamps detect battery health status.
- Multi-function as a flashlight and phone charger.
Tacklife T8
- 800 amp compact lithium jump starter.
- Budget option good for most vehicles.
- Built-in alarm and LED light.
- Provides up to 30 jump starts per charge.
- Cigarette lighter for charging devices.
Using Your Portable Jump Starter Safely
While portable jump starters make starting your car much more convenient, there are some safety precautions to follow:
Read the Manual
Read the instruction manual completely before using your jump starter. Follow all warnings and connection procedures.
Make a Secure Connection
Attach the clamps tightly to clean, bare metal spots on the battery terminals. This ensures good electrical contact.
Avoid Sparks
Sparking can occur if the connection is interrupted when current is flowing. Turn the jump starter off before removing the clamps.
Don’t Overcharge the Battery
Most models automatically shut off when the car engine starts. Always disconnect shortly after.
Check Battery Levels
Many jump starters have built-in battery level indicators. Recharge after each use and check levels every 3–6 months.
Store Properly
Keep your jump starter cool and dry in temperatures between 40°F and 80°F when not in use to maximize battery life.
Maintaining Your Portable Jump Starter
With proper care and maintenance, a portable jump starter can deliver reliable service for years:
Recharge After Each Use
Fully recharging the internal battery after every use will maximize the lifetime of lithium-ion jump starters.
Inspect Cables and Clamps
Check for any wear and tear over time on the cables and connectors. Replace clamps if they aren’t tightly grabbing or making good contact.
Clean the Exterior
Use a damp cloth to clean the outside of the unit and prevent dirt buildup on the connections. Avoid submerging the jump starter in water.
Replace Batteries
Lithium-ion jump starters may need a new battery after 3–5 years if holding less charge. Replacing lead-acid batteries every 1–2 years extends lifespan.
Check Before Winter
Ensure your jump starter has a full charge before winter temperatures set in, when the cold can sap battery charge. Store in a warmer area.
By selecting the right portable jump starter for your vehicle, using it properly, and performing regular maintenance, you can count on fast and convenient starts whenever you need them. The ability to quickly recharge your battery anywhere provides confidence and security.
FAQs
How long does a portable jump starter battery last?
Most lithium jump starters will last 3–5 years or 200–300 charge cycles if properly maintained. Lead-acid batteries last 2–3 years.
Can a portable jump starter damage your car?
When used properly, a jump starter will not damage your vehicle. Always follow safety precautions to avoid issues.
How many amps do I need in a portable jump starter?
For most sedans and small SUVs, a minimum of 400 peak amps is recommended. Larger vehicles may need 800–2000+ peak amps.
What size battery can a portable jump starter start?
Compact portable units can typically start batteries up to around 5–6 liters gas or 4–5 liters diesel. Larger jump starters are needed for V8s, heavy duty trucks.
Are portable car battery jump starters better than jumper cables?
Jump starters are more convenient as they don’t require another vehicle. However, jumper cables are useful in certain situations when a second car is available to provide power.
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