These are perfect. Exactly what I was trying to do. Have a serious set of cables that were very long and stayed very flexible in the cold. With enough thickness to retain amperage over 25 feet. And the price was reasonable. A bag is needed, like one of those cloth grocery bags or so. Oversize the bag, because you are probably going to not want to wrap it back up tight when its super cold out. The length I'd nice because batteries can be on the far side of the hood and sometimes you can't pull in front of the car. I guess I jump a lot of cars. Lol.

Connect as follows.
Black to dead car negative then
black to live car negative then
red to dead car positive and finally
red to live car positive. When you do this, you should notice the drain.

Get in live car and give it some gas to up the RPMs a little. Try to start dead car. Repeat every couple minutes. Disconnect cables in reverse order. Don't let black and red clips touch when the other end is connected to a live or dead battery. I asked my mechanic friend if they were any good. He noticed the softness in the cold weather too. I just got sick of moving the working car back and forth to get close enough so the cables would reach. Or worse, pushing the dead car/truck to a workable angle. I probably could park behind the car and reach them with the 25 foot length( I'm going to try it next time).

By the way. It doesn't hurt to jump to an executive at your company who is trying to catch a plane but can't leave because his rental is dead.

They feel like of decent quality. I have only used these just once. But they did there job quit well actually. A coworker was to cheap to replace a shorted relay that was draining his battery nonstop. So basically, everyday he battery was dead. After the first few days of watching the other trades jumping him (and taking a while to do it). I decided to buy a set myself. As you never know when you will need a set, and it was time to replace mine that were lost/stolen. I only had to jump his Accord once, but the one time I had to was quick and painless. These allowed enough energy transfer to allow his Honda to start after only a few seconds. Whereas the few other times I saw him get a jump, took up to two minutes.

Will they always be this good? Probably not. But at this price, it's ok. This is model of carrying bag I bought to hold them in.

http://www.amazon.com/gp/product/B00GK4U24Y?psc=1&redirect=true&ref_=oh_aui_detailpage_o08_s00

Nice set of jumper cables, long enough for just about any jump, even across cars they are pretty flexible and easy to "untangle" ( which is a good thing when they a' long lol ) -I have used them a couple of times already and they handled the job well. I also own the FJC 45255 1 Gauge Commercial Duty 25' Booster Cable - 800 amp( which came with their own case to store them in ) purchased here on Amazon also and these cables are not as stiff or thick as them but seem to work just as well, and for less money :-P . four stars for good cables, would be five stars if they came with a storage bag or a rigid box to store them in.

If you want a good set of long cables at a good price get these while you can

Yeah, you read that right, $240.00 for the same set of cables at a NAPA auto parts store on Guam, USA.

PRO:

1. Saved $187.00 !!!!!
2. These things are REAL, heavy duty and long!
3. Stiff clamps, coated clamps and attached very well.
4. Did I mention these are REALLY LONG!

CON:

1. Need some trunk space to carry these 24/7, they are not small. so be ready for that.
2. Not for chicks with fake nails, buys that can't lift 5 pounds and small children.

OTHER:

DO NOT UN COIL THESE WHEN YOU GET THEM, they way they pack them at the factory and put the twist tie around them is the SMALLEST you'll ever get them, once you open them up and stretched them out, they're not EVER going to be that small again. SO get them pack them away and use them when you need them.

Peace!

When you want an industrial set of booster cables that is long enough and strong enough to jump just about anything a mere mortal would do, look no further! These things are impressive in construction, function, and quality. When you pull them out you can almost hear the theme to "Excalibur" playing in the background with angels singing at full chorus. But seriously, if you want to buy one set of jumper cables as in investment that will not only last your lifetime but for generations to come, this is the end all be all. I highly recommend the Bucket Boss carrying case as the perfect compliment. On your death bed of regrets with everyone on the edge of their seat as they're picking through your remains you can state, "and finally, I leave my beloved FJC Booster cables too..." In this case you get what you pay for.