Is it only to jump start a car with weak/dead battery or also it can maintain a car battery by recharging it after the car not used for some days?
1173888
This unit can be used to run a variety of small electronic devices, including laptop computers and radios. It also does well with charging a cell phone. It would not be suitable for maintaining a car battery. There is a voltage differential that would prevent it from being effective. The unit puts out slightly less voltage than would be needed to maintain a trickle charge, even though it is adequate to start a vehicle.
1779185
I have one it is a backup battery that is hidden. So if the main battery would get cut or disabled the car is still protected. Its just an extra layer of security.
1448668
No battery might be an advantage with regarding auto-connecting and power on/off with car start. Might not be bad.
2084462
I not sure but we have never damaged a charger by accidently hooking it to the battery wrong. You would more likely risk explosion or damage to the battery or sensitive electronics in the vehicle you are jump starting.
1470194
Yes. I haven't had it very, but I have used it 3 times so far. Jump started my car, charged my other car battery and used it on my lawn mower battery to charge it as well. So far I love it. Very easy to use.
1923652
use car battery. When you start your car. The alternator will recharge the battery
128249
Starts as soon as power supplied. You have to be careful not to leave it plugged in all the time or it could drain your battery. I leave mine plugged in every where I go and unplug it at night. Some cars like mine give you the option of continuous power when the car is shut off or a separate plug to shut it down, when car turns off.
1086930
This could "jump start" any car, but beware that the battery in this is very small (like rated at 5 amp/hour). I have another brands "jump-start" that has a 18 amp/hour battery and just to experiment, I disconnected my car battery and hooked mine up. It started the car (a ford festiva 4 cyl), but the starter was barely turning the engine. If that's what happens on a small car with a much bigger battery than this, I'd be very surprised if this would be able to start a V6 or bigger engine with a fully drained battery (like from leaving the lights on all night). If you left on some lights while in a movie for 2 hours it may have a chance, but that's all I'd expect. Feel free to look at reviews of this and similar priced ones (that have a similar battery) to see if there are a fair number of others saying the same thing I am.
2115395
Car batteries are not meant to be drained down. The answer is not long. Once drained your car battery will need to be jumped. Also a car battery becomes damaged once it is drained a few times. This is also dependent on what you are powering. A cell phone charger or a hairdryer.
2146765
I used it to jump my Ford 5.0 V-8 and it worked. I forgot to plug it in to keep charging (you can leave the new ones plugged in all the time) and when i needed it again a month and a half later it didn't have enough power to jump the car. I plugged it in for 4 hours and not only jumped the car, but was able to use it as the battery while we did some repairs to the ignition system. It has plenty of power. There may be smaller amp jump starters that will work, but if they don't you may as well have nothing. This thing works.
1997266
If you are talking about starting the car, then yes you leave the cars battery cables attached to the car's battery. Word of warning: The one thing that will kill this unit is if you leave it attached to the car for more than a few seconds AFTER the engine starts. The alternator in the car will go to full charge which is more charging current than this unit can handle. One of the guys in my shop left one attached and went to the parts dept. It was physically destroyed when he got back. So start the car, and disconnect the unit.
2194361
It's actually correct and safer for the negative cable to be attached to a strong ground on the car as opposed to being connected directly to the battery's negative terminal. (This is how to properly connect jumper cables to the auto your jumping, as well. Most do not do this or are not aware.)
51626
Schumacher told me that if the battery is dead to connect it to a good one in a nearby vehicle for about 15 minutes using jumper cables to get the dead battery up to about 3 volts because their products won't charge a battery that is "dead-er" than one having less than 3 volts in it. After the 15 minutes, you can detach the jumper cables and use the Schumacher unit to increase the charging of the battery.
1204543
This unit does not charge batteries. It is a 'jump-starter' that you connect to a weak battery to assist that weak battery in starting a car. It's like having a second battery with 'jumper cables.'
1060028
No. It isn't a charger, it is a jump starter which means that it is just another battery used to temporarily "boost" the battery in the car that is weak. While this jump starter has a built-in charger for it's own battery, it cannot be used to charge your car battery--the selector switch/dial can either be set to "jump" (on) your car battery or "charge" (off) to charge itself, it will not allow the charger to function while the jump battery is connected to your car battery.
947738
It is mainly used to "jump start" your battery, and not used as a "battery charger". Hope this answers your question..
1969916
Yes, this is a 12VDC battery. It won't jump start your car, but will charge the car battery enough so your car will start. You leave it connected to the car battery for about 20 minutes then disconnect the Power Tank before starting your car, or it could damage the Power Tank. It doesn't have enough starting amps to jump start a car. It is great to use to charge your phones when the power goes out. It will run 2 telescopes for many hours when your out in the middle of nowhere. The led flashlight is awesome, but never use at a star party, or you won't be invited back, it is so bright.