WOLFBOX 4000A Jump Starter,12V Car Battery Jumper Starter Portable with 65W Quick Charger,LED Display,88.8Wh Booster Jump Box Pack (10L Gas 10L Diesel Engine) with LED Light,Jumper Cables

Awesome jump starter. Easy to use, compact and just works. Useful to aid batteries in the frigid temperatures start ups. Used on Tractor after sitting in below freezing temps, robust on start. Only used 2% of stored energy. Nice readout. Only downside is the short cable. Not a deal breaker.

This jump starter is state of the art! It is extremely powerful and can jumpstart your dead battery as if it was fully charged. It also has ports for charging your phone, tablet etc. It is extremely easy to use and compact so that you can keep it in your vehicle at all times when needed. Very easy to use even for someone that has never had to jump start their vehicle before. You cant go wrong in buying this product. I would steer away from cheaper brands. It would do you well to stay with this product over others.

Charged to full and placed in my car. Needed it the very next day. Easy hook up, worked perfectly. Something has drained my battery several times and I haven’t had opportunity to take the vehicle to the dealership. Whatever the problem is, it has only been happening intermittently. That being said this battery jumper gives me peace of mind for now and any future battery problems. Anyone could read the directions and be able to use it to jumpstart a car. Great item to carry in your car. Can’t speak to this item’s longevity but it seems to be well made. I carry it in a lower storage compartment in back of my suv. It’s a little larger than some I have seen so if you may want to measure if planning to carry in your dash/glove compartment.

This unit represents a good compromise, between pure ultra capacitor versions that have no internal battaries and larger size units that potentially have higher capacity ultra capacitors and larger lithium ion batteries. The former ones relay on the remaining capacity of the partly discharge battaries to charge the ultra capacitors which actually jump start engines while the latter ones use internal battaries. In my case the use is double fold: for jump starting in case of emergencies and for running electronics while biking. I tested both. The unit had no problems starting a V8 with battery partly discharged, and was capable of topping off a bike mounted camera along with an advanced Garmin computer for 3 plus hours while only consuming 10% of battery capacity. It was also neatly kept in a larger size frame mounted bag on the bike.

I have a 2004 Saturn Ion that I don't drive often and have a continuous issue with the battery draining just enough that it won't turn over the engine. Been using a 4 amp Battery Tender, but was looking for something more convenient. I first bought another brand of jump starter, but it couldn't start a little 2.4L engine. Gave Wolfbox a go and glad I did. I had charged the jump starter over the previous weekend, so it was ready to be tested. Charges quick, has some weight to it and doesn't feel cheap. Went out this morning, car didn't start. Followed the directions, got in, turned the key in the ignition, and the engine turned over and fired right up! Awesome tool! And it only used 2 percent of the charge.

I would love to give this starter 5 stars, but for whatever reason it has to be on boost mode to start my Ram 1500. The charger that comes with it, the 65Watt wall box is phenomenal. It will start my truck, but I didn't think it would need to the boost.. I had to start an Outback wagon, no issues at all. Cranked right up. It's a great product for the money. I will probably buy a second one for my wife to have on standby.

Unequivocally, my rating is FIVE STARS! I consider the Wolfbox a perfect product for its purpose! I am 80 years and 8 days of age and I had gone outside to run some errands and discovered that the battery in my 2005 Cadillac was totally dead - no interior lights or sounds. That evening I got online to Amazon and spent time studying all of the lithium battery powered mobile jump starters listed there. I finally made my decision to purchase the Wolfbox. No help or advice from anyone in the middle of the night. I first made sure that I had "Free Return" just in case that my choice might turn out to be a bad one. Then I placed my order at midnight. Prime delivered the Wolfbox the next day after lunch. I checked the items in the box, read the instruction booklet and proceeded to charge the Wolfbox up to 100%. Then I went outside, opened the hood of my car and attached the Wolfbox to the car according to the Cadillac operating manual. I followed the easily understood directions from Wolfbox and I got my car's motor started in about ten minutes while standing under the blazing Texas Sunshine in over 100 degrees heat. I disconnected the Wolfbox, hopped in my car and drove away to run my errands with all electrical equipment functioning and the air conditioning cooling me. Wolfbox is so great that I want to star in a TV commercial for the Super Bowl for maximum global coverage that should go viral for Wolfbox's contribution to the empowerment of Women's independence - even in their most senior years! I have always said that Triple AAA is is really Great and is a single girl's Best Friend - but you do have to wait around on their schedule! But with Wolfbox, my new BFF, I had an instant jump that kept me on my schedule with No Muss, No Fuss and No Bother! I am so satisfied with Wolfbox that I will be posting my experience on my Facebook Page! Thank you Wolfbox for a wonderful product that is so well protected in its own case and sold at an affordable price. Wolfbox did for sure design a very useful product that checked all of my boxes for purchase. I am a disabled senior citizen female who is now a Very Happy Camper! Thank you Wolfbox! Thank you Amazon! I wish I had had someone to video me jump starting my car but you will just have to take my word for it!

Hands down the best portable jump pack had my diesel with 2 dead battery start instantly used less than three percent of pack and charges really fast