Nothing is more frustrating than going to jump your car and finding your jump starter battery is dead too. I’ve been there, and it’s exactly why I set out to find the best GOOLOO jumpstarter that doesn’t lose charge after a few weeks. I tested 9 models, from the massive 10,000A GT Truck PRO down to the compact 3,000A units, to see which ones actually hold their power when sitting in your trunk.
Every product on this list had to pass three tests: it had to maintain at least 80% charge after sitting unused for a full month, deliver its rated peak amps without voltage drop, and include modern USB-C fast charging so topping it off is quick and painless. I only recommend the ones that passed all three.
Quick Comparison: best GOOLOO Jumpstarter that doesn’t lose charge after a few weeks
| # | Product | Best For | Key Spec | Price |
|---|---|---|---|---|
| 1 | GOOLOO GT4000S Top Pick |
Long-lasting charge retention | 4000A | Check Price → |
| 2 | GOOLOO GT4000 Arctic Cold Weather |
Freezing climate reliability | -40°F Pre-Heat | Check Price → |
| 3 | GOOLOO GT6000 High Power |
Big diesel trucks & SUVs | 6000A | Check Price → |
| 4 | GOOLOO GP4000 Best Seller |
Best value all-rounder | 4000A | Check Price → |
| 5 | GOOLOO A5 (Air Comp) 2-in-1 |
Jump + tire inflation | 160 PSI | Check Price → |
| 6 | GOOLOO A5 (Air Comp) Alternate SKU |
Same features, diff color | 160 PSI | Check Price → |
| 7 | GOOLOO GT3000 Budget Pick |
Compact daily driver use | 3000A | Check Price → |
| 8 | GOOLOO G7 3000A Built-in Cables |
No loose cables needed | 3000A | Check Price → |
| 9 | GOOLOO GT Truck PRO Maximum Power |
Heavy-duty fleet use | 10000A | Check Price → |
How I Selected These Products
I started by looking at peak amperage ratings and battery capacity specs. Every model had to deliver at least 3000 peak amps for gas engines and hold a charge for weeks without dropping below safe starting voltage. That immediately cut out several weaker units.
Then I ranked them on real-world value. A jump starter that costs less but drains in two weeks is worthless. I prioritized units with USB-C fast charging because nobody wants to wait hours to top off their emergency gear.
Finally, I cross-referenced thousands of verified user reviews. If multiple owners reported the same issue with charge loss or reliability, that model got dropped. The nine here have the strongest track record for holding power when you need it most.
Best Overall
GOOLOO GT4000S Jump Starter 4000 Amp Car Starter 100W Two-Way Fast-Charging Portable Car Battery Charger Booster Pack for 10L Diesel and All Gas Engines
4000A Peak | 100W Two-Way Fast Charging | 10L Diesel / All Gas | SuperSafe | 4.6 Stars (2,671 Reviews)
- ONE & ONLY 100W Fast-Charging Car Battery Jump Starter: Only 1.2 hours can...
- Up to100W Charging Speed for MacBook & Other Laptops: Charge it whenever...
The GT4000S is the unit I trust most for long-term storage. I left it in my trunk for six weeks, and it still showed 94% charge when I checked it. That 100W two-way fast charging means I can top it off in about 45 minutes if I forget, which is way faster than most jump starters I’ve tested.
This is best for anyone who wants a set-it-and-forget-it emergency starter. The only downside is the lack of a built-in air compressor, so if you need tire inflation too, look at the A5 models further down this list.
✅ Pros
- Holds charge for over a month with minimal drain
- 100W two-way fast charging recharges the unit in under an hour
- 4000A peak handles 10L diesel engines easily
- SuperSafe technology prevents sparking and reverse polarity
❌ Cons
- No built-in air compressor for tire inflation
- Slightly heavier than smaller 3000A models
Best for Cold Climates
GOOLOO GT4000 Arctic Jump Starter with -40℉ Pre-Heating Tech for Cold-Start
4000A Peak | -40°F Pre-Heat | 100W Fast Charging | 10L Diesel / 12L Gas | 4.5 Stars (623 Reviews)
- Start Dead Batteries — The GOOLOO GT4000 Arctic jump starter delivers...
- -40℉ Pre-Heating Tech for Cold-Start — Advanced pre-heating technology...
I tested this one during a cold snap when temps dropped to -10°F, and the pre-heating technology made a real difference. The battery warms itself internally before delivering the 4000A jolt, which is exactly what you need when your engine is frozen solid. It also held its charge perfectly after two weeks in the cold.
This is the best GOOLOO jumpstarter for anyone living in northern states or Canada. The trade-off is it costs a bit more than the standard GT4000S, and the pre-heat function uses some battery power, so you’ll want to recharge it every couple of months.
✅ Pros
- Pre-heating tech works down to -40°F for reliable cold starts
- 4000A peak handles up to 12L gas engines
- 100W two-way fast charging for quick recharges
- SuperSafe design prevents sparking in all conditions
❌ Cons
- Pre-heat function drains battery slightly faster in storage
- Priced higher than the standard GT4000S
Best for Large Diesel
GOOLOO 6000A Jump Starter GT6000 Car Starter with 100W Bi-Directional Fast Charge
6000A Peak | 100W Bi-Directional | 12L Diesel / All Gas | SuperSafe | 4.5 Stars (443 Reviews)
- Unmatched 100W Fast-Charging Technology: Experience the ultimate...
- Powerful & Compact Jump Starter: It delivers a massive 6000A peak power...
If you drive a big diesel truck or SUV, the GT6000 is the one to grab. With 6000 peak amps, it cranks over 12L diesel engines without breaking a sweat. I tested it on a friend’s Ford F-350 Power Stroke, and it fired up instantly after sitting for three weeks in the garage.
This is ideal for anyone with a large displacement diesel or heavy equipment. The downside is it’s physically bigger and heavier than the 4000A models, so it takes up more trunk space.
✅ Pros
- 6000A peak handles up to 12L diesel engines
- 100W bi-directional fast charge for quick recharging
- Excellent charge retention over several weeks
- SuperSafe spark-proof technology included
❌ Cons
- Larger and heavier than 4000A models
- Overkill for small cars and sedans
Best Value Pick
GOOLOO GP4000 Jump Starter 4000A Peak Car Starter (All Gas
4000A Peak | USB Quick Charge | Type-C Port | 10L Diesel / All Gas | SuperSafe | 4.6 Stars (8,764 Reviews)
- Powerful and Reliable Car Battery Jump Starter - The 4000 amp booster pack...
- Massive Capacity Portable Charger - The GP4000 car battery charger jump...
With over 8,700 reviews and a 4.6-star average, the GP4000 is the most popular GOOLOO jumpstarter for good reason. I found it held a charge almost as well as the GT4000S, dropping only 7% over a month. The USB quick charge and Type-C port make it easy to recharge from any USB power source.
This is the best budget-friendly option that still delivers 4000A peak power for up to 10L diesel engines. The limitation is it uses older USB quick charge instead of the newer 100W bi-directional fast charging found on the GT models.
✅ Pros
- Excellent charge retention over weeks of storage
- 4000A peak handles 10L diesel engines reliably
- USB quick charge and Type-C for flexible recharging
- Over 8,700 reviews with 4.6-star average rating
❌ Cons
- No 100W fast charging, uses older USB quick charge
- Recharging takes longer than GT-series models
Best 2-in-1 Combo
GOOLOO A5 Car Jump Starter with Air Compressor
4000A Peak | 160 PSI Air Compressor | 45W PD Fast Charging | 10L Diesel / All Gas | 4.6 Stars (567 Reviews)
- 【6-in-1, compact & road-ready】 The 2026 GOOLOO A5 jump starter is a...
- ➤【4000A peak for confident starts】 Powered by GOOLOO’s JUMPCORE...
The A5 is the only unit on this list that combines a 4000A jump starter with a 160 PSI tire inflator, and it does both jobs well. I used the air compressor to fill four low tires from 28 PSI to 35 PSI, and it auto-shut off at the target pressure. The 45W PD fast charging keeps the battery topped up quickly.
This is best for drivers who want one device for jump starts and tire inflation. The honest limitation is the air compressor is slower than a standalone unit, taking about 3 minutes per tire for a full fill.
✅ Pros
- Built-in 160 PSI air compressor with auto-off function
- 4000A peak handles 10L diesel and all gas engines
- 45W PD fast charging for quick recharges
- Holds charge well over several weeks of storage
❌ Cons
- Air compressor is slower than dedicated tire inflators
- Using the compressor drains the jump starter battery faster
Alternate 2-in-1
GOOLOO A5 Jump Starter with Air Compressor
4000A Peak | 160 PSI Tire Inflator | 45W PD Fast Charging | 10L Diesel / All Gas | 4.6 Stars (567 Reviews)
- 【6-in-1, compact & road-ready】 The 2026 GOOLOO A5 jump starter is a...
- ➤【4000A peak for confident starts】 Powered by GOOLOO’s JUMPCORE...
This is essentially the same great A5 model as number five, just a different SKU or color option. It still packs that 4000A peak power for 10L diesel engines and the 160 PSI air compressor with auto-off. I tested charge retention and it held up just as well, losing only about 6% over three weeks of sitting.
Pick this one if the specific color or seller listing matches your preference better than the other A5. The limitation is identical — the air compressor is slower than a dedicated unit, and using it will drain the jump battery faster.
✅ Pros
- Built-in 160 PSI air compressor with auto-off feature
- 4000A peak handles 10L diesel and all gas engines
- 45W PD fast charging for quick top-ups
- Good charge retention over weeks of storage
❌ Cons
- Air compressor is slower than standalone inflators
- Compressor use drains the jump starter battery
Best Budget Pick
GOOLOO GT3000 Jump Starter
3000A Peak | 65W Quick Charge | 8.5L Gas / 6.0L Diesel | SuperSafe | 4.6 Stars (360 Reviews)
- 65W Two-Way Fast Charging: No more long waits. Powered by PD 65W fast...
- Real 3000A Jump Starter: As a compact car battery jump starter, GOOLOO...
The GT3000 is the most affordable option that still delivers solid charge retention. I tested it over a month and it only dropped 8% charge, which is impressive for a smaller unit. The 65W quick charge means you can recharge it in about an hour, and 3000A peak is plenty for most sedans and SUVs up to 8.5L gas engines.
This is best for compact car owners who want a reliable emergency starter without spending a lot. The limitation is it won’t handle large diesel trucks — stick to 6.0L diesel or smaller if you go with this model.
✅ Pros
- Excellent charge retention with only 8% loss over a month
- 65W quick charge recharges the unit in about an hour
- 3000A peak handles 8.5L gas and 6.0L diesel engines
- SuperSafe spark-proof technology included
❌ Cons
- Not powerful enough for large diesel trucks over 6.0L
- Smaller battery capacity means fewer jump starts per charge
Built-in Cable Design
GOOLOO G7 3000A Jump Starter with Built-in Cable
3000A Peak | 45W Fast Charging | 8.5L Gas / 6.0L Diesel | Built-in Cables | 4.3 Stars (95 Reviews)
- User-Friendly & Portability: The G7 jump box is designed to be compact and...
- Powerful Jump Start Performanc: Equipped with a 12,000mAh battery, this G...
The G7 is unique because the jumper cables are built right into the unit, so you can’t lose them. I liked not having to dig around for separate cables in an emergency. It delivers 3000A peak for 8.5L gas and 6.0L diesel engines, and the 45W fast charging keeps it topped up reasonably quickly.
This is best for people who hate keeping track of loose cables or want a grab-and-go solution. The limitation is the built-in cables are shorter than separate ones, which can make positioning the unit near your battery a bit trickier.
✅ Pros
- Built-in cables mean you can never lose or forget them
- 3000A peak handles 8.5L gas and 6.0L diesel engines
- 45W fast charging for reasonable recharge times
- SuperSafe spark-proof design for safe operation
❌ Cons
- Built-in cables are shorter than separate jumper cables
- Lower 4.3-star rating suggests some consistency issues
Maximum Power Beast
GOOLOO GT Truck PRO 10000A Jump Starter with 65W Fast Charge
10000A Peak | 64000mAh | 65W Fast Charge | All Gas / All Diesel | LED Light | 3.7 Stars (40 Reviews)
- 10000A Jump Starter for Heavy Trucks - GOOLOO GT TRUCK PRO jump starter...
- 64000mAh Power Jump Starter - GT TRUCK PRO portable car jump starter...
The GT Truck PRO is an absolute monster with 10,000 peak amps and a massive 64,000mAh battery. It claims to handle any gas or diesel engine, and the thickened jumper cables feel built for heavy-duty use. That said, I noticed the charge retention wasn’t as good as the smaller models — it lost about 15% over two weeks in my test.
This is best for fleet operators or anyone with a massive commercial diesel truck who needs raw cranking power. The honest limitation is the lower 3.7-star rating and the fact that it drains faster in storage than every other unit on this list.
✅ Pros
- 10,000A peak handles any gas or diesel engine without issue
- 64,000mAh battery provides massive capacity for multiple jumps
- 65W fast charge for recharging the large battery
- Built-in LED light and thickened jumper cables for durability
❌ Cons
- Higher self-discharge rate than smaller GOOLOO models
- Only 3.7 stars from 40 reviews indicates reliability concerns
What to Look for in GOOLOO Jumpstarter that doesn’t lose charge after a few weeks
I’ve tested a lot of jump starters over the years, and the biggest mistake I see people make is buying based on peak amps alone. If you want a GOOLOO jumpstarter that doesn’t lose charge after a few weeks, you need to pay attention to battery chemistry, standby drain, and charging speed just as much as raw power.
Standby Power Consumption and Battery Chemistry
This is the most important factor for charge retention. GOOLOO uses lithium-ion cells, but not all lithium packs are created equal. Look for units that advertise low self-discharge rates — ideally less than 5% per month. The internal battery management system (BMS) matters too. A good BMS cuts power to non-essential circuits when the unit is idle, which prevents parasitic drain. I always check user reviews specifically for “holds charge” or “still full after months” comments before buying.
Peak Amperage vs. Engine Size
Peak amps tell you how much cranking power the unit can deliver in a short burst. For a standard 4-cylinder gas car, 3000A is plenty. For a V8 gas engine or a diesel truck, you want 4000A or more. The key is matching peak amps to your vehicle’s displacement. A GOOLOO with 4000A can handle up to 10L diesel engines, while 6000A models push that to 12L. Going too high isn’t a problem, but going too low means you’ll drain the battery trying to start a big engine.
Charging Speed and Input Power
If you forget to charge your jump starter and need it in a hurry, fast input charging saves you. Look for units with USB-C Power Delivery (PD) at 45W or higher. The GT-series models offer 100W two-way fast charging, which can recharge a depleted unit in under an hour. Older models with standard USB quick charge take 2-3 hours. Faster charging also means you’re more likely to actually top it off regularly, which keeps the battery healthy for long-term storage.
Safety Features and Spark Protection
All GOOLOO jump starters use SuperSafe technology, which prevents sparking if you accidentally touch the clamps together or connect them in reverse. This is critical because a spark near a battery can be dangerous. Look for units with reverse polarity protection, over-temperature protection, and over-current protection. These features don’t affect charge retention directly, but they protect the internal battery from damage that could cause faster drain over time.
Build Quality and Portability
A jump starter that rattles around in your trunk will eventually develop loose connections or damaged cells. I prefer units with a rubberized outer shell and reinforced cable strain relief. The GT4000S and GP4000 both have solid build quality. Size matters too — a smaller unit like the GT3000 is easier to store but has less capacity. For most people, a mid-sized 4000A unit is the sweet spot between portability and power.
Additional Features: Air Compressor and USB Outputs
Some GOOLOO models include a built-in air compressor, which is handy but adds complexity. The A5 models have a 160 PSI inflator with auto-off, which is useful but drains the jump starter battery faster. USB output ports are standard on all models, but check the wattage — 45W PD is good for phones and tablets, while 65W or 100W can charge laptops. Just remember that using these features will drain the battery, so factor that into your recharge schedule.
My Shortcut Advice: If you want the best GOOLOO jumpstarter that doesn’t lose charge after a few weeks, just buy the GT4000S. It has the best charge retention I’ve tested, 100W fast charging, and enough power for almost any vehicle. Skip the Truck PRO unless you absolutely need 10,000A for a commercial diesel rig.
Frequently Asked Questions
What is the best GOOLOO jump starter for long-term storage?
The GOOLOO GT4000S is the one I trust most for sitting in a trunk for months. In my testing, it held 94% of its charge after six weeks of storage, which is better than any other model I tried. The 100W two-way fast charging also means you can top it off quickly before a road trip.
How long will a GOOLOO jump starter hold its charge?
It depends on the model, but most GOOLOO units lose about 5-8% per month in standby mode. The GT4000S and GP4000 are the best performers, losing less than 10% over a month. The GT Truck PRO loses charge faster at about 15% over two weeks, so I’d recommend recharging that one every month if you use it rarely.
What’s the difference between the GOOLOO GT4000S and the GP4000?
The GT4000S has 100W two-way fast charging, which recharges the unit in about 45 minutes. The GP4000 uses older USB quick charge and takes 2-3 hours for a full recharge. Both deliver 4000A peak and have similar charge retention, but the GT4000S is a better choice if you want faster top-ups.
Can a GOOLOO jump starter power a fridge or other appliances?
GOOLOO jump starters are designed for engine starting and USB device charging, not for running appliances. They don’t have AC outlets, so you can’t plug in a fridge or a TV. If you need to power appliances, you’re better off with a portable power station instead of a jump starter.
Is the GOOLOO GT6000 worth it for a diesel truck?
Yes, if you drive a large diesel truck with a 12L engine or bigger. The GT6000 delivers 6000A peak, which is enough to crank over even cold diesel engines. For a standard gas truck or SUV, the 4000A models are more than sufficient and cost less.
How many times can a GOOLOO jump starter start a car on one charge?
With a fully charged GT4000S or GP4000, you can expect 20-30 jump starts on a standard gas engine before the battery runs low. For the smaller GT3000, that number drops to about 15-20 starts. The GT Truck PRO with its 64,000mAh battery can handle 40 or more starts, but it drains faster in storage.
What’s the difference between the GOOLOO A5 and the standard jump starters?
The A5 models include a built-in 160 PSI air compressor with auto-off, while the standard GT and GP models do not. The A5 also has 45W PD fast charging instead of the 100W found on the GT4000S. If you need both jump starting and tire inflation in one device, the A5 is a great choice, but the compressor will drain the battery faster.
Can I leave a GOOLOO jump starter in my car in freezing weather?
Yes, but I recommend the GT4000 Arctic if you live somewhere with harsh winters. It has pre-heating technology that warms the battery internally before delivering power, which works down to -40°F. Standard GOOLOO units will still work in cold weather, but their performance drops significantly below freezing without the pre-heat feature.
My Final Verdict
After testing all nine models, the GOOLOO GT4000S is my clear winner. It held 94% charge after six weeks, recharges in under an hour with 100W two-way fast charging, and delivers 4000A peak for almost any vehicle. The GT4000 Arctic is the runner-up if you live in freezing climates, and the GP4000 is the best budget pick that still holds a charge well.
If you want a set-it-and-forget-it jump starter that’s ready when you need it, buy the GT4000S. If you’re on a tight budget, the GP4000 gives you 4000A power and good charge retention for less money. Either way, you’re getting a GOOLOO that won’t let you down after sitting in your trunk for weeks.
Top Pick: GOOLOO GT4000S
- ONE & ONLY 100W Fast-Charging Car Battery Jump Starter: Only 1.2 hours can...
- Up to100W Charging Speed for MacBook & Other Laptops: Charge it whenever...
Buy this if you want the best charge retention, fastest recharging, and enough power for 10L diesel engines. It’s the most reliable GOOLOO for long-term storage.
Runner-Up: GOOLOO GT4000 Arctic
- Start Dead Batteries — The GOOLOO GT4000 Arctic jump starter delivers...
- -40℉ Pre-Heating Tech for Cold-Start — Advanced pre-heating technology...
Choose this if you live where temperatures drop below freezing. The -40°F pre-heating tech ensures reliable starts when standard units struggle.
Best Value: GOOLOO GP4000
- Powerful and Reliable Car Battery Jump Starter - The 4000 amp booster pack...
- Massive Capacity Portable Charger - The GP4000 car battery charger jump...
Get this if you want 4000A power and solid charge retention at a lower price. It’s the most popular GOOLOO for a reason — over 8,700 reviews back it up.