RescueMate 12-Volt Super Capacitor Jump Starter – 750 Amp

Well after getting my first jump in only a couple days after buying this product, I can now honestly saw that this thing is great.Came out this morning to a completely dead battery on my Ford Ranger. Totally dead. No lights, no locks, nothing. Oh, and to add insult to injury, this was on a lovely 20F morning. In that situation, I knew I wasn't going to get any trickle charge off the vehicles own battery so I popped the hood on my Jeep, attached the OzCharge, and watched it charge up almost immediately. Like seriously fast. Faster than popping the hood. Walked back over to the Ranger, hooked up the OzCharge, gave it a moment to recognize it was connected, hit run and watched as it immediately started counting down from 10. I then jumped over to the igitition, and as soon as I saw lights comes on, turned the key. The truck started right up!Had I not had the second vehicle handy, I know I could have charged up via USB from any phone charger, but as usual I was running late so I was grateful for the immediate charge. If I had to choose one criticism, I wish that the buzzer that tells you when to crank was louder. I used the OzCharge on a really quiet morning and I could barely hear it. It was fairly obvious when to turn the key though since the interior lights came on, etc...All in all this is a great product. I've gone through a half dozen standard jump starters and either their never charged when you need them, or they inevitably die and won't take a charge after a year or two. Lithium ion jump starters are great for their size, but I don't trust their typically cheap construction and don't love the idea of leaving a fully charged lithium ion battery in a hot vehicle. With the OzCharge, both of these concerns are addressed. Based on the technology and heavy duty construction, I expect to get many many more uses out of it for years to come.

Update:Do not buy it is impossible to get a hold of anyone to file a warranty claim. My unit is defective it would not charge. I've called, emailed, left vm. DO NOT PATRONIZE. You have been warnedYou think you can push a Honda CR-V parked in the middle of the parking lot surrounded by other car on a slight downgrade? This bad boy worked like a champ forgetabout the battery jumper and the cable jumper.

A great tool to keep in the car just in case. I've successfully jump-started my car (4.5L V8) multiple times with it. Unlike the typical lithium-ion jump-starters, you don't have to remember to charge it every month or two; just forget about it until you need it. I haven't tried it in cold weather, but according to the manufacturer, it works down to -40 degrees F. This is much better than lithium-ion jump starters, which typically struggle in the cold. I had one that left me stranded when it was below zero--not fun. Also, since the battery is the weakest link in most units and the OzCharge has none, I expect it to last much longer than a battery-based jump-starter.Another thing I like is that the OzCharge's safety features don't defeat the purpose of the product. Many lithium-ion jump-starters have obnoxious "safety" features that prevent the device from working unless it is connected directly to the battery. This is a problem with a car like a BMW or Porsche that requires major surgery to get to the battery. I was able to jump-start one of these cars with the OzCharge by using the connection points under the hood, without having to access the battery itself.Like any jump-starter, there are limits to what the OzCharge can do. On one occasion, it was unable to start my car. I tried jump-starting it with another running vehicle and that didn't work either, so I had to call a tow truck. The car's battery was shot and should have been replaced before it got to that point, so I don't blame the OzCharge.

I have had to jump my car several times and even my riding lawnmower. This has been a real lifesaver! It is a little awkward to charge just because the charging plug in is small and recessed. It seems expensive for what it is, but, really worth it if you think you are going to need it. I travel a lot and really eases my mind to know I have something this reliable in my car. This thing will work on residual battery charge as well as a dead battery. This is really neat technology that I believe is unique to this product. You can bypass your battery to start your car if you really need to, but, is not recommended. But nice to know that if you really had to, you can start your car working battery or not. Understand how it works before you have to use it so you are not stuck wasting time trying to figure it out in an emergency situation.

Had bad battery on my suvUsed it to start few times worked greatThan my daughter in-law had battery issues soon afterShowed her how to use and she used itEasy to useBrought to keep in vehicle since do not need to keep chargedGlad I brought it works as advertised

For now, it just keep charging, but never get fully charged and can’t be used to start an engine. It was working perfectly…

It worked once and has not worked like it should again. Great idea just does not work.

Tested on my friends car worked great hope i don't have to use it but piece of mind knowing its there, it arrived 3 days earlier than expected to the UK.