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29

Yes, this is a bad battery. One of the cells has most likely shorted. Each cell is a little above 2vdc. A fully charged battery will usually be ~13vdc. If you lose one cell, it will drop it down ~2vdc, which puts it right down in the arena of 10.5vdc. A direct short inside of a cell will allow electrons to pass through the short instead of raising the ...


23

As Miracle Max would say, there's two kinds of dead batteries, and there's a big difference between them. Mostly Dead This is the most common kind of dead battery. Let's say your battery is rated for 300 cold cranking amps. After several years of use, it degrades until it reaches, say, 250 amps. Your battery isn't out of power, it just can't get your engine ...


12

Those types of chargers are designed to provide short bursts of power to start a car, most do not have a battery charging mode. Once the car is started the alternator will complete charging the battery. Some of these chargers have a USB output for charging phones, but they don't have the capacity to charge a car battery back to full.


3

Look at the lower left-hand corner. It says "VW AG" which indicates this is a VW OEM battery. The "2509" says, I assume that it was made in the 25th week of 2009 which is in line with your 2010 model year. As to whether this is the original battery in your car, it's difficult to say with certainty but this sure looks like an original ...


2

Miracle Max notwithstanding. There are a relatively few (more like very few) jump starters which directly start the vehicle with little or no involvement from the vehicle battery. Most jump chargers which advertise large starting current capabilities are marketing hype with about no relationship to reality. The majority of jump chargers transfer charge at a ...


2

I am going to be in the minority here, but I have had success jump-starting my SUV with a larger version of what you are showing only after letting it sit connected to the battery for 10+ minutes My car has a power drain issue that no one has been able to figure out in 7+ years. So I've needed to jump start my car frequently, so i bought a larger version of ...


1

I learned long ago to not charge the battery but go directly for the engine (one contact to the postive pole and the negative to the enginge block to avoid damage from small flashes. not sure this is at all a good idea or even possible today, maybe someone with knowledge can evaluate?


1

If the voltage on the battery pack is higher than the voltage on the car's battery, it will charge the battery to some extent. How much depends on the voltage, capacity, and charge level of the 2 batteries. It is unlikely that the jump pack will be able to charge the battery enough to start the car without the jump pack. As others have said, the intended ...


1

There is a reason why a car battery is big and heavy, and the portable kits are not - they have not nearly enough power to charge a battery. But there is no need or use to charge a dead battery before starting the car - just jump-start the car, and once it is running, its alternater will load the battery just fine. It is a good idea to run the car for 15-30 ...


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