Carlbros

CB40 Heavy Duty Jump Starter 40S Fast Recharge 18000A 12 24 Volt Battery Jump Pack for Gas Diesel

4.5(11)
$583.00$613.69

60+ bought in the past month

About this item

  • 40 SEC SUPER FAST RECHARGE - CARLBROS CB40, professional heavy duty jump starter with a LiFePO4 battery. Powerfully boost 12V & 24V vehicles. Keep the jumper cables connected for 40 sec after a successful jump, the booster pack quickly regains 100% original battery status. 25-mintues recharge from 0 to 100%. You can start a whole fleet with our new tec. Hassle-free jump starts, no need to frequently recharge with DC charger.
  • SAVE COMPLETELY DEAD BATTERIES - Carlbros CB40 is compatible with both 12V & 24V systems. Our class-leading voltage detection automatically jump starts as low as 0.3-volt (others at 2V). The self-heating function ensures CB40 jump starter power pack starts dead batteries in extremely cold -22℉ condition effortlessly. With over 18000A starting power, it starts almost all gas & diesel vehicles, including semi-trucks(up to class 8), motorhomes, buses, mining, agricultural, industrial, and vocational equipment - 6, 8, 12, and 16 cylinder.
  • COMMERCIAL GRADE - CB40's long-lasting LiFePO4 battery lasts more than 4 times longer than any lead-acid jump starters. Carlbros CB40 is built for professionals who frequently jump-start dead batteries daily, roadside rescuers, mechanics, fleet managers, tow services. Whether in a repair shop, garage, logistics, farming, mining, or construction, the CB40 battery booster pack handles heavy jump-start tasks with ease. CARLBROS is your final solution for jump start.
  • FRIENDLY & SAFE - Super easy to use, just connect, start, and go. The CB40 jump start battery pack with a smart 2-inch LCD display keeps you informed in real-time. The battery booster jump starter is equipped with multiple intelligent safety features like spark-proof and reverse polarity protection. Plus, the Carlbros car battery jump starter automatically shuts off when you squeeze and remove the clamps, preventing accidental short circuits and offering more safety.
  • LIGHTWEIGHT & COMPACT -Only 19.84lbs, easily lift with the handle. The semi truck jump starter's mid-book-sized design fits in tool carts, service vans, roadside boxes, or under-seat compartments. Whether you're in a workshop or towing service, Carlbros heavy duty jump starter delivers independent, reliable power, helping people in trouble get back on the road quickly.
  • READY FOR ANY EMERGENCY - This 12/24V battery jump pack combines a booster pack, portable power bank, and emergency flashlight features. Dual USB ports fast recharges your smartphone and other USB-C devices. A super bright 500-lumen LED light with five modes, including SOS. Don’t get caught off guard, CarlBros is always ready.
$583.00
Was $613.69Save $30.69

In Stock

Easy Returns · Return eligibility shown before checkout


How you'll get this item

DeliveryShipping details confirmed at checkout

Fulfillment

Ships fromVentari
Sold by
Carlbros Direct
Returns
Easy ReturnsReturn eligibility shown before checkout
PaymentsPayment details confirmed at checkout

Currently unavailable
Easy Returns · 30-day window
Product details
BrandCarlbros
Battery Cell CompositionLithium-Phosphate
Voltage12 Volts, 24 Volts
Product Dimensions5.51"D x 13"W x 13.19"H
Vehicle Service TypePassenger Car, Bus, Van, ATV, RV, UTV, Truck, Watercraft, Tractor

From the brand

Product detail
Product detailProduct detailProduct detailProduct detailProduct detailProduct detailProduct detailProduct detailProduct detailProduct detailProduct detail

Product videos

Product video 1

Customer reviews

4.511 ratings
  1. 567%
  2. 417%
  3. 30%
  4. 217%
  5. 10%
★★★★★

Lightweight and lots of power

Fishmo Services IncJanuary 21, 2026✓ Verified purchase

This thing is awesome. Lightweight and good starting power. Read more

★★★★★

Great

Thomas CrawfordJanuary 3, 2026✓ Verified purchase

Life saver Easy to use Read more

★★★★★

Carlbros heavy duty jump start

fredrett grantOctober 31, 2025✓ Verified purchase

Work great!! Had no problem jump starting my simi truck when regular cable won't come close to starting my truck...thanks, this will always be my go to.. Read more

★★☆☆☆

Red cord too short for a semi truck

Michaelgr124December 29, 2025✓ Verified purchase

Just got the box the day after Christmas and took it to the truck to try and jump the battery. I charged this thing up to 100% and took it to the truck and it didn't start the truck. It might be because the truck has been sitting for 4 months now and it's snowing 🌨 like crazy outside. Also, I drive a Freightliner Cascadia and the batteries are tucked in the truck behind the staircase and the red cable cord is way too short for it to fit properly. I thought maybe the cords pull themselves out but it doesn't. In order for me to get it to work I had to turn the battery pack backwards just to get it to fit. I'm going to try one more time to see if it will work, if not I'll be sending this back. 700 bucks is a lot of money for this not to work. Carlbro needs to let the cables be retractable. Read more

★★★★☆

Solid unit so far.

Glen BakerNovember 19, 2025✓ Verified purchase

Works as it should, fired up a Peterbilt. The connectors are a bit too short, especially with large trucks or equipment. Will update in 6 mo or so. Read more

★★★★★

Great

David RiddleOctober 31, 2025✓ Verified purchase

It works great Read more

Recently Viewed

We use optional analytics cookies to understand how visitors use Ventari and improve the experience. This banner controls analytics measurement only. See our Cookie Policy.