T8 MAX 3000 Amp Jump Starter, 100W Two-Way Fast Charging, for Up to 10.0L Gas and 8.0L Diesel Engines, Digital Screen, 12V Car Battery Booster Standard Package-Gray

**5.0 out of 5 stars** Saved my butt twice in one month — this thing is a beast and worth every penny Reviewed in the United States on June 28, 2024 Verified Purchase I bought the Fanttik T8 MAX 4000A jump starter on Amazon on May 3, 2024, after my 2019 Ram 3500 with the 6.7L Cummins left me stranded one too many times with a weak battery. I wanted something that could actually wake up a big diesel in -10°F weather and not just be a toy for little cars. This unit has now started that truck twice (once at -4°F), my wife’s V8 Grand Cherokee once, and even helped a neighbor with his completely dead F-250. Zero failures. **Why it’s head-and-shoulders above everything else I’ve owned:** - Real 4000 peak amps. My diesel cranked like the batteries were brand new — no slow chug, just instant fire-up. - The color LCD screen is brilliant. Shows exact percentage, voltage before and after connection, countdown timer in BOOST mode, and even tells you if you have the clamps backwards (saved me once already). - 100W USB-C input actually recharges the unit from 0-100% in about 90 minutes with my MacBook charger. Most “fast charge” jump starters still take 6+ hours. - Holds charge like a champ. Sat in my truck console for 6 weeks and still showed 98% when I needed it. - Built like a tank. Rubberized corners, IP65 dust/water resistant, and the clamps are heavy-duty with thick copper jaws. - Bonus features I actually use: 300-lumen flashlight with SOS/strobe, and the two USB ports (65W PD + QC3.0) have charged my phone faster than my old 20,000mAh Anker. **Real-world saves:** 1. -4°F morning in May (yes, Midwest weather), truck battery at 8.7V — hit BOOST for 30 seconds and it roared to life on the first try. 2. Wife left the Jeep lights on for 3 days — stone dead. Normal mode started it in under 5 seconds. **Tiny gripes (nothing deal-breaking):** - It’s bigger and heavier than the little 1000A units (about the size of a large paperback), but that’s the trade-off for real diesel-starting power. - The carrying case is decent but the zipper feels a little cheap — I just toss the whole thing in my center console anyway. At $159 (what I paid during a Prime deal), it’s cheaper than one tow truck call for my diesel, and it’s already paid for itself twice. If you own anything bigger than a sedan — especially a diesel — stop messing with the under-rated Amazon specials and just buy this. I’ll never be stranded again. 100% confidence, 100% recommended.

This one will spin the engine at 16v - plenty enough to start most engines. The difference between this model and the model below it is that this one does not require you to press power + light to kick it to the more powerful mode. This one remains in that 16v mode from the moment you hook the battery up. My other one (lesser model), I had to write directions in bright marker on the unit; however, If you are not the one using it, no one is going to know to press power + light buttons at the same time to make it work properly. Even with my writing, if it is dark out, no one will see it or read it. It's a silly design TBH. Get this one instead. You can catch it on sale and get it for close to the same price as the less expensive one

Very excited to try this! Looks like excellent quality. Only gripe is it says 100 watt fast charging comes with chargers but the car charger is 18 watts and there is no 100 watt charge block. Hoping for one included with the high price. I dont have a mac charge block or similar so am stuck slow charging. Slightly misleading advertising imo. Update: Upping it to five stars because I took it on a one week camping trip out in the middle of nowhere and had to jump start my vehicle every day of the trip and it worked perfectly I had to use the dead boost mode every time and it saved my butt.

So simple to use, even the least car savvy can operate. Love it provides multiple boost of single charge

In over a year I have used it 5 or 6 times to start vehicles. Works great. I haven't even charged it after the initial charge when I got it and it's still at 89%