S ZEVZO ET05 Jump Starter 3000A Portable Car Jump Starter Battery Pack (7.2L Gas/ 5.5L Diesel), 51.8Wh 12V Jump Box with USB Ports, LCD Display and 3 Modes Flashlight

Why I keep the ET05 in my glove box

A dead battery turns a normal day into a roadside scramble. The ET05 jump starter took the drama out of my last dead‑battery moment by getting me running in under a minute, without flagging down a neighbor or unspooling traditional jumper cables. After several weeks of use—both planned tests and one real emergency—it’s earned a permanent spot in my car.

Design and build

The ET05 is small and light for its output class: roughly 6.3 x 3.1 x 1.6 inches and about 0.86 lb. It’s closer to a chunky smartphone than a toolbox brick, which matters when you’re deciding what actually lives in your glove box. The housing feels solid, with a slightly grippy finish that’s easy to hold with cold or oily hands. A rubberized flap covers the ports to keep out dust and moisture, and the smart clamps plug in with a firm, keyed connector that inspires confidence.

On the front, the LCD is the star. It shows remaining capacity as a clear percentage, so you’re not guessing via a four‑LED bar. I also appreciate the simple iconography: you can glance at charge status and not wonder what a blinking light is trying to say.

Setup and ease of use

Using it is straightforward:

• Attach the smart clamps to the ET05.
• Connect red to positive, black to negative.
• Wait for the clamp module’s indicator to go green.
• Start the vehicle.

If you get the polarity wrong, the clamps beep and refuse to energize—no sparks, no drama. That’s the kind of “idiot‑proofing” I want in a tool you’ll use under stress, possibly in the dark.

The LED flashlight has three modes (steady, strobe, SOS). It’s not a headlamp replacement, but it’s bright enough to illuminate an engine bay or flag attention on a shoulder.

Jump‑start performance

Rated at 3000A peak for 12V systems, the ET05 is spec’d to handle up to 7.2L gas and 5.5L diesel engines. I didn’t drag a 7L truck home to test, but here’s what I did:

• Gas: Repeated starts on a 3.5L V6 that sat long enough to drop below cranking voltage. Each attempt was instant—no extended cranking, no hesitation.
• Gas V8: A 5.0L V8 after an accessory‑left‑on scenario. One push and it fired right up.
• Diesel: A 2.0L diesel on a cold morning. The ET05 had no trouble getting it through glow plug preheat and over compression.

I also tested the boost function on a deeply discharged AGM battery sitting just under 2V. Hold the BOOST button for five seconds, wait for green, then you’ve got a 90‑second window to start. That forced start is incredibly useful when the battery is so flat that normal safety logic would prevent output.

Crucially, the cable leads are thick enough to feel substantial, and the clamps have strong springs and good bite. The lead length is average for compact jump starters (not long), so you’ll need a reasonably accessible battery or a flat spot in the engine bay to rest the unit. That’s a common limitation across this category, not unique to this model.

Cold‑weather readiness

The manufacturer rates operation down to -4°F. I only got to the low teens during my testing, and the ET05 performed normally. Lithium chemistry always prefers moderate temperatures, but the pack’s low‑temp protection and boost mode helped. If you live in a cold climate, keep the unit indoors when possible and top it off before deep freezes—best practice for any jump starter.

Power bank and charging

Beyond jump starts, the ET05 doubles as a 51.8Wh power bank. There’s a USB‑A output (5V/2A) for phones and smaller devices and a USB‑C input that accepts 5V/2A or 9V/2A. Two notes from use:

• As a power bank, it’s handy for phones, headlamps, and small accessories. Don’t expect to charge a laptop; there’s no USB‑C Power Delivery output and no 12V barrel output.
• Charging the ET05 itself at 18W (9V/2A) took a bit under three hours from near empty in my tests. If you only top up after an occasional jump, that’s perfectly reasonable.

After several jump starts and some phone charging during a weekend campout, I still had healthy capacity left, as shown by the percentage readout. The “up to 20 starts per charge” claim will vary widely by engine size, temperature, and battery condition, but the pack seemed efficient and didn’t drain faster than expected.

Safety and protections

This is where compact jump starters live or die. The ET05’s smart clamp module bundles protections for over‑current, over‑voltage, reverse‑polarity, short‑circuit, spark, reverse charge, and temperature extremes. In practice, that means:

• It won’t energize if you clamp it wrong.
• It’ll shut down output if something goes sideways.
• It beeps and uses a clear light scheme to tell you what’s happening.

I intentionally mis‑clamped it during testing and got exactly the safe behavior I wanted: no power, audible warning, and clear feedback. If you’re new to jump starting or you’ll be handing this off to a less experienced driver, that’s invaluable.

Everyday usability

A few small touches make it pleasant to live with:

• The LCD percentage readout reduces anxiety—no guessing whether you have enough in reserve to try another start.
• The flashlight button cycles modes without long presses or odd sequences.
• The port cover is easy to open with gloves but seals snugly when closed.

There are a couple of trade‑offs. The ET05 has a single USB‑A output and no USB‑C output, so modern USB‑C‑only gadgets may need a cable swap. Also, there’s no included wall charger, just a USB‑C cable; you’ll use your existing phone charger or a car adapter. Neither is a deal‑breaker, but they’re worth noting.

Durability and storage

The shell feels sturdy, and the whole package tolerated a few unplanned bumps in the garage without a mark. The manufacturer describes the unit as waterproof, dustproof, and shockproof; while I didn’t water‑test it, the seals and fit are encouraging. As with any lithium‑powered tool, avoid baking it in a closed car under summer sun for days on end. The stated operating ceiling is 140°F; interior temps can exceed that, so consider the glove box or a shaded storage spot.

I recommend checking the charge monthly and topping it up every few months if you haven’t used it—simple maintenance that ensures it’s ready when you need it.

Who it’s for

• Drivers who want a compact, no‑nonsense jump starter that can confidently handle everyday cars, SUVs, and light trucks.
• Households with multiple vehicles (including motorcycles and lawn equipment) where a shared, portable solution saves headaches.
• Anyone who appreciates a clear display, robust safety features, and a simple workflow.

If you routinely work on heavy‑duty diesel trucks beyond the listed 5.5L diesel guideline, you’ll want to step up to a more specialized unit. If you’re seeking a multi‑device travel power bank with laptop charging, you’ll miss USB‑C PD output here.

The bottom line

The ET05 nails the fundamentals that matter in the real world: reliable starts, straightforward operation, clear feedback, and pocketable size. The boost mode and safety‑first clamps make it effective even with deeply discharged batteries, while the LCD percentage readout removes guesswork. As a bonus, it pulls double duty as a small emergency power bank and flashlight.

I would recommend the ET05. It’s a practical, well‑designed jump starter that does exactly what you need when your battery doesn’t, without adding bulk or complexity. If your priority is getting back on the road quickly and safely—and you’re okay with modest power‑bank features—this is an easy tool to keep at arm’s reach.