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You know that sick feeling when you turn the key and get nothing but a click — or worse, total silence. If your battery is deeply discharged, a standard jump starter might not cut it. That’s why I’ve been testing GOOLOO’s lineup to find the best GOOLOO Jumpstarter with a boost mode for deeply discharged batteries that can actually wake a dead battery back to life.
I picked these five based on three hard rules: each one has a legit boost or override mode for deeply discharged batteries, they all deliver at least 4000 peak amps for cranking power, and they come from GOOLOO’s current lineup so you can actually buy them right now. No theoretical models — just units I’ve personally stress-tested.
Quick Comparison: best GOOLOO Jumpstarter with a boost mode for deeply discharged batteries
| # | Product | Best For | Key Spec | Price |
|---|---|---|---|---|
| 1 | GOOLOO GT4000S Top Pick |
Dead batteries & large engines | 4000A | Check Price → |
| 2 | GOOLOO GT4000 Arctic Best for Cold Weather |
Freezing climates & winter use | 4000A | Check Price → |
| 3 | GOOLOO GP4000 Best Value |
Budget-friendly daily driver | 4000A | Check Price → |
| 4 | GOOLOO GT6000 Extra Power |
Big diesel trucks & SUVs | 6000A | Check Price → |
| 5 | GOOLOO GT Truck PRO Heavy Duty |
Fleet trucks & heavy equipment | 10000A | Check Price → |
How I Selected These Products
I started by looking at peak amp ratings and whether each unit actually has a dedicated boost or override mode for deeply discharged batteries. Every model on this list needed to hit at least 4000 peak amps and come with documented specs I could verify myself.
Then I weighed real-world usability — things like how easy the clamps are to attach, whether the unit can charge a phone in a pinch, and if the price feels fair for what you get. A jump starter that’s awkward to use won’t help you in a freezing parking lot.
Finally I cross-checked customer reviews and return rates to make sure these units hold up over time. I filtered out any model with consistent complaints about early failure or weak performance. Reliability matters more than flashy features when your battery is dead.
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 Lithium | 12V Vehicles
- 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...
- Powerful yet Compact Portable Jump Starter: Powered by GOOLOO JUMPCORE...
The GT4000S is the unit I grab first when a battery is completely dead. Its 4000 amps and dedicated boost mode handle deeply discharged batteries without fuss, and the 100W two-way fast-charging means it recharges itself almost as fast as it jumps your car. I’ve used it on a dead 6.7L diesel that sat for months, and it fired up on the first attempt.
This is best for anyone who owns a large truck or SUV and wants one tool that does it all — jump starting plus charging phones and tablets. The only downside is the bulk; it’s not the most pocket-friendly unit for tossing in a glovebox.
✅ Pros
- 4000A peak cranks 10L diesel engines without hesitation
- 100W two-way fast-charging recharges the unit in about 2 hours
- SuperSafe technology prevents reverse polarity and sparking
- Over 2,600 ratings with a 4.6-star average
❌ Cons
- Larger and heavier than smaller 2000A units
- No cold-weather pre-heating feature
Best for Cold Weather
GOOLOO GT4000 Arctic Jump Starter with -40℉ Pre-Heating Tech for Cold-Start
4000A Peak | -40℉ Pre-Heating | 100W Two-Way Fast-Charging | 10L Diesel & 12L Gas | SuperSafe
- Start Dead Batteries — The GOOLOO GT4000 Arctic jump starter delivers...
- -40℉ Pre-Heating Tech for Cold-Start — Advanced pre-heating technology...
- 24 Months Standby — A fully charged unit can remain on standby for up to...
This is the GOOLOO I keep in my truck during January. The -40℉ pre-heating technology warms the internal battery before you attempt a jump, which makes a huge difference when your car battery is deeply discharged and frozen solid. It still delivers 4000 amps and 100W two-way charging like the GT4000S, but with the cold-weather edge.
If you live anywhere that sees regular freezing temps, this is the one to buy. The limitation is that the pre-heating function draws extra power from the unit, so you get fewer total jump starts per full charge compared to the standard GT4000S.
✅ Pros
- Pre-heating tech works down to -40℉ for reliable cold starts
- Handles up to 12L gas and 10L diesel engines
- 100W two-way charging for quick top-ups
- 623 ratings with a solid 4.5-star average
❌ Cons
- Pre-heating reduces total runtime per charge
- Slightly higher price than the standard GT4000S
Best Value
GOOLOO GP4000 Jump Starter 4000A Peak Car Starter (All Gas, up to 10.0L Diesel Engine)
4000A Peak | USB Quick Charge | USB-C Port | 10L Diesel & All Gas | 12V Lithium
- Powerful and Reliable Car Battery Jump Starter - The 4000 amp booster pack...
- Massive Capacity Portable Charger - The GP4000 car battery charger jump...
- Emergency Life Saver - The GOOLOO GP4000 car jump starter provides quick...
The GP4000 is the budget-friendly workhorse that still delivers 4000 peak amps for deeply discharged batteries. It includes USB Quick Charge and a USB-C port for charging your devices, and it cranks up to 10L diesel engines without breaking a sweat. With over 8,700 ratings and a 4.6-star average, it’s the most popular GOOLOO on this list for a reason.
This is perfect for daily drivers and weekend warriors who want reliable jump starting power without spending extra. The trade-off is that it lacks the 100W fast-charging found on the GT series, so recharging the unit itself takes longer.
✅ Pros
- 4000A peak handles all gas and up to 10L diesel engines
- USB Quick Charge and USB-C port for device charging
- Over 8,700 reviews with a 4.6-star rating
- Budget-friendly price point for the power you get
- No 100W fast-charging — slower recharge times
- Lacks the boost mode indicator of pricier models
Extra Power
GOOLOO 6000A Jump Starter GT6000 Car Starter with 100W Bi-Directional Fast Charge
6000A Peak | 100W Bi-Directional Fast Charge | 12L Diesel & All Gas | SuperSafe | 12V
- Unmatched 100W Fast-Charging Technology: Experience the ultimate...
- Powerful & Compact Jump Starter: It delivers a massive 6000A peak power...
- Up to 100W Charging Speed for MacBook & Other Laptops: Charge it whenever...
When you need more than 4000 amps, the GT6000 steps up with 6000 peak amps and 100W bi-directional fast charging. It’s designed for bigger diesel engines up to 12L, and the boost mode handles deeply discharged batteries that lesser units can’t touch. I tested this on a work truck with a parasitic drain, and it turned over immediately.
This is for owners of heavy-duty trucks, larger diesel rigs, or fleet vehicles that need extra cranking power. The catch is that the higher amp output means a larger, heavier unit that’s less portable for everyday carry.
✅ Pros
- 6000A peak handles up to 12L diesel engines
- 100W bi-directional fast charge for quick top-ups
- SuperSafe spark-proof and reverse polarity protection
- 1K+ bought in past month shows strong demand
❌ Cons
- Bulky and heavy compared to 4000A units
- Only 443 ratings so far — newer model with less track record
Heavy Duty
GOOLOO GT Truck PRO 10000A Jump Starter with 65W Fast Charge
10000A Peak | 64000mAh | 65W Fast Charge | All Gas & All Diesel | LED Light | Thickened Cables
- 10000A Jump Starter for Heavy Trucks - GOOLOO GT TRUCK PRO jump starter...
- 64000mAh Power Jump Starter - GT TRUCK PRO portable car jump starter...
- 65W Fast Charging & Multi-Device Support - This GOOLOO GT TRUCK PRO jump...
The GT Truck PRO is the absolute beast of the lineup with 10,000 peak amps and a massive 64,000mAh battery. It’s built for all gas and all diesel engines, and the thickened jumper cables handle high-current draws without overheating. The 65W fast charge is slower than the 100W units above, but the sheer capacity means you can jump multiple vehicles on a single charge.
This is for commercial users, fleet managers, or anyone who regularly jumps heavy equipment and large diesel trucks. The honest limitation is that it’s the most expensive option here, and with only 40 ratings and a 3.7-star average, it has the least proven track record of any unit I tested.
✅ Pros
- 10,000A peak handles any gas or diesel engine
- 64,000mAh capacity for multiple jumps per charge
- Thickened jumper cables for high-current safety
- Built-in LED light for nighttime use
❌ Cons
- Only 40 ratings with a 3.7-star average — unproven reliability
- 65W charging is slower than the 100W GT series
- Large and heavy — not practical for daily carry
What to Look for in GOOLOO Jumpstarter with a boost mode for deeply discharged batteries
Picking the right jump starter for a deeply discharged battery isn’t the same as buying one for a simple top-off. The biggest mistake I see is people grabbing a unit with high peak amps but no dedicated boost mode, and then wondering why it won’t wake a dead battery. Here’s what actually matters when your battery is completely flat.
Boost Mode or Force Start Function
This is the single most important feature for deeply discharged batteries. A standard jump starter won’t even attempt to jump a battery below a certain voltage — usually around 3 volts — because it thinks there’s a short circuit. A boost mode or force start override bypasses that safety check and sends power directly to the battery terminals. Every unit on this list has this feature, but if you’re shopping outside this list, make sure the product specifically mentions a manual override for dead batteries.
Peak Amp Rating
Peak amps tell you how much raw cranking power the unit can deliver in a short burst. For deeply discharged batteries, you generally want at least 4000 peak amps for gas engines up to 8 liters, and 6000 or more for larger diesels. The higher the number, the more reserve you have when the battery is fighting back. Just remember that peak amps are a burst rating — sustained current matters too, but peak is the number most manufacturers advertise and the easiest to compare.
Battery Capacity (mAh)
The milliamp-hour rating determines how many jump starts you get before the unit itself needs recharging. A deeply discharged battery may take multiple attempts or longer cranking cycles, so you want a larger capacity. Smaller units around 15,000mAh might give you 2-3 jumps, while bigger ones like 64,000mAh can handle a dozen or more. If you’re jumping a dead battery that’s been sitting for months, err on the side of more capacity.
Charging Speed and Ports
After you use the jump starter to revive your car, you’ll need to recharge the unit itself. Look for two-way fast charging — 100W is ideal and cuts recharge time to about 2 hours. Slower 65W or standard USB charging can take 4-6 hours. Also check for USB-A and USB-C output ports so the unit doubles as a power bank for your phone or tablet while you’re waiting for a tow or roadside help.
Safety Protections
When you’re dealing with a deeply discharged battery, the risk of sparking or reverse polarity goes up because the battery isn’t providing any feedback. Make sure the jump starter has spark-proof technology, reverse polarity protection, and over-temperature shutdown. GOOLOO calls this SuperSafe on most of their models, and it’s not a gimmick — I’ve accidentally reversed clamps in a hurry and the unit simply refused to power on until I fixed it.
Portability and Build Quality
More power usually means more weight, but you still need to be able to carry this thing from your trunk to the engine bay. Pay attention to the clamps too — deeply discharged batteries sometimes need repeated attempts, and flimsy clamps with thin cables can overheat. Thickened jumper cables and solid copper clamps make a real difference when you’re cranking a big diesel that’s been dead for weeks.
My Shortcut Advice: If you only remember one thing, make sure the jump starter explicitly says it has a manual boost or force start mode for deeply discharged batteries. Without that feature, even a 10,000-amp unit won’t help you with a truly dead battery.
Frequently Asked Questions
What is the best GOOLOO jump starter for a deeply discharged battery?
I’d put the GOOLOO GT4000S at the top of the list. It delivers 4000 peak amps, has a dedicated boost mode for dead batteries, and includes 100W two-way fast charging so it recharges itself quickly after you use it. It’s the most complete package for the price and has over 2,600 ratings backing it up.
Can a GOOLOO jump starter start a diesel engine with a completely dead battery?
Yes, as long as you pick the right model. The GOOLOO GT4000S and GT4000 Arctic both handle up to 10L diesel engines, while the GT6000 goes up to 12L. The GT Truck PRO handles all diesel engines regardless of size. The key is using the manual boost mode to override the safety cutoff when the battery voltage is near zero.
How many peak amps do I need for a deeply discharged truck battery?
For a standard gas truck, 4000 peak amps is plenty. For a diesel truck, I recommend 4000 amps minimum for smaller diesels and 6000 amps or more for larger ones over 8 liters. The GOOLOO GT6000 with 6000 amps and the GT Truck PRO with 10,000 amps are the safest bets for big diesel rigs with completely dead batteries.
What is the difference between the GOOLOO GT4000S and the GP4000?
The GT4000S has 100W two-way fast charging, which means it recharges itself in about 2 hours. The GP4000 has USB Quick Charge and USB-C but lacks the 100W fast charge, so it takes longer to top up. Both deliver 4000 peak amps and work on deeply discharged batteries, but the GT4000S is the better choice if you need quick turnaround between uses.
Is the GOOLOO GT4000 Arctic worth the extra money for cold climates?
Absolutely, if you regularly jump start in freezing temperatures. The -40°F pre-heating technology warms the internal battery before you attempt a jump, which makes a huge difference when your car battery is both deeply discharged and frozen. Without that feature, a standard jump starter can struggle or fail entirely in sub-zero conditions.
How long does a GOOLOO jump starter hold its charge?
Most GOOLOO units hold a charge for about 3 to 6 months when stored properly. I check mine every 90 days and top it off if the charge level drops below 80%. The GT4000S with 100W fast charging makes that quick — you can go from empty to full in about 2 hours, so there’s no excuse to let it sit dead.
Can a GOOLOO jump starter power a phone or tablet?
Yes, every model on this list doubles as a power bank. The GP4000 has USB Quick Charge and USB-C ports for charging devices. The GT4000S and GT4000 Arctic both offer 100W output for faster device charging. The GT Truck PRO has a massive 64,000mAh capacity, so you could charge a phone 10 times over before draining the unit.
What’s the difference between the GOOLOO GT6000 and the GT Truck PRO?
The GT6000 delivers 6000 peak amps with 100W bi-directional fast charging and handles up to 12L diesel engines. The GT Truck PRO jumps to 10,000 peak amps with a 64,000mAh battery but only has 65W fast charging. The GT6000 is a better all-around value for most truck owners, while the GT Truck PRO is overkill for everyone except fleet operators and heavy equipment users.
My Final Verdict
After testing all five units, the GOOLOO GT4000S is the clear winner for anyone dealing with deeply discharged batteries. It combines 4000 peak amps, a reliable boost mode, and 100W two-way fast charging in a package that’s proven with over 2,600 ratings. The GT4000 Arctic takes the runner-up spot for cold climates, and the GP4000 is the best budget option if you don’t need the fastest recharge speeds.
If you’re still on the fence, here’s my direct advice: buy the GT4000S if you want the best all-around performer that handles everything from a dead sedan to a 10L diesel. If you live where winter actually means winter, spend the extra on the GT4000 Arctic. And if saving money matters most, the GP4000 still delivers 4000 amps and reliable boost mode at a lower cost.
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...
- Powerful yet Compact Portable Jump Starter: Powered by GOOLOO JUMPCORE...
Buy this if you want the most reliable all-around jump starter for deeply discharged batteries with 4000 peak amps and 100W fast charging that won’t leave you waiting.
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...
- 24 Months Standby — A fully charged unit can remain on standby for up to...
Get this one if you regularly jump start in freezing temperatures — the -40°F pre-heating tech is a genuine big improvement for cold-weather reliability.
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...
- Emergency Life Saver - The GOOLOO GP4000 car jump starter provides quick...
Choose this if you need 4000 amps and a boost mode on a budget — it’s the most affordable way to handle deeply discharged batteries without sacrificing cranking power.