Jump Starter Battery Pack, 4500A Peak Car Battery Charger Jump Starter for Up to 10.0L Gas or 8.0L Diesel Engine,12V Car Jumper Starter Portable with Full LCD Screen (4500A)

I was sceptical of the functionality of this jump-starter due to the price of $25. Originally I was planning on purchasing a "Batteryless" jump-starter but did not want to spend $125 so I figured I give this one a try and if it didn't work well I would return the unit.But, to my surprise, this jump-started works much better than I expected.I tested the unit on a completely dead 7 year old battery. The old battery will not hold a charge at all.Even the interior dome light was not illuminating.And to my surprise my truck cranked and started like there was a fully charged battery. The start was not a slow crank at all.The battery in my truck is 7 years old and I am aware that it needs to be replaced but I wanted to test the starter multiple times.I started the truck 5 times in a row and it started like I had a new battery installed each time.After 5 starts the battery level on the jump-starter was at 50%, but I believe I used up 50% because the battery is no good any longer.The way the jump-starter seems to work is, the unit detects the voltage, or the state of charge, then it juices up the capicitors with-in a few seconds. If the battery is shot like the one in my truck, it draws the power from the capicitors, the green light goes off for a couple seconds while the capicitors re-energize, and the cycle starts over again.I think I would have drawn less from the jump-starter if my battery wasn't shot.I attached the jump-starter on a fully charged good battery and the green light was solid and stayed lit because the battery was not sdrawing all the power from the capicitors.I have used other jump starters like this in the past and there were several steps that must be completed before cranking to start the car. ... turn unit on, set to boost, wait a couple minutes for the green light, and start. If the start failed on the first try one would have to go through that 3 step cycle again.But unlike older jump-startes, these capicitors re-energize within a couple seconds.Also, with this unit, all you have to do is hit the power button, a couple seconds later the green light illuminates and the car is ready to be started.I am really impressed with Gillaway Jump Starter Battery Pack, 4500A Peak Car Battery Charger Jump Starter for Up to 10.0L Gas or 8.0L Diesel Engine.I plan on leaving the Gillaway jump-starter in the car charged to 75/80% in an attempt to make the unit last as long as possible. (Li-Ion batteries age faster when stored at 100%)It would be great if this jump-starter used exchangable 18650 batteries. Chances are, this unit is actually using a couple 18650 batteries, so if the batteries in this unit ever do fail I will probably be able to replace & solder replacments if needed, but I'm not going to open the case untill required.The Gillaway jump-starter came shipped at 70% batter level. I topped off jump-starter to 100% and 2 weeks later it is still at 100%, so that tells us that it does have a li-Ion battery. If it had a NiCad battery it would not have remained at 100%.Again, I am pleasently surprised and pleased with this jump-starter.It works just as well as a $125 jump-starter.I will update this review in a couple months.

NEEDED TO JUMP START MYCAR WITH THIS JUMP STARTERAS MY CAR BATTERY WAS LOW OF VOLTAGE OF MYCAR BATTERY I USED ONES AND AS FAST OF THIS JUMPSTARTER WORKED IT STARTEDMY CAR RIGHT AWAY THATFAST I SAY THANK YOU FORTHIS OF ORDERING THIS NICEJUMP STARTER ON A SUNDAY MORNING WITH AMAZON TOGET THAT SAME SUNDAY GOTIT FAST AT NOON SUNDAYWITH AMAZON THANK YOU AMAZON AND SELLER VERY NICE WORK THANK YOU I LIKETHIS JUMP STARTER AND USBPORTS FOR CHARGING YOUR PHONE OTHER DEVICES WORKS GREAT THIS JUMP STARTER NICE ITEM!MARCO SCHOLLITT

This thing works just as advertised. It was not fully charged (was at 75% per the easy to read built-in screen), but it started my car easily. I had charged the car's battery a bit but it was only able to "rattle" the starter. Connected this to the battery and the car acted like its battery was fully charged.

One of the springs on the clip on fell out but still working without it

This device my be small but it is mighty. I jumped 3 cars back to back with out any hesitation.

Worked perfect. Used it to jump off my zero turn mower. Cranked first try! Would definitely recommend to others.

Perfect for jumping your car when battery power drops.. Love it

Honestly didn't expect this to work as good as it did and for the price you can't beat it. Definitely recommended