2 Gauge Vs 4 Gauge Battery Cable: What is the best wire for Jumper Cable?

We all have to make a jump start in an emergency situation when a car battery fails. But have you ever become confused about which gauge should you buy for the best service?

While talking about jump-start, jumper cables are the main emergency tool in your car. According to AWG, there are various wire gauges. Today we’ll review 2 Gauge Vs 4 Gauge for your better choice.

Gauge according to AWG

According to transferring wattage, there are different types of wire, thicker or thinner. Wire gauge is the thickness of wire that demonstrates how thick the wire is. The less number means more thick wire.

AWG or American Wire Gauge commonly standardised wire thickness through the North American region. 

AWG or wire gauge is a parameter of wire thickness. Here gauge number means wire thickness. Low gauge numbers are thicker wire than others.

2 Gauge Vs 4 Gauge: What are the differences? 

Have you ever thought that battery cable gauge matters? Of course, if you’ve to transfer more wattage at a time, you need a thick gauge. However, there are various considerable differences before you buy a gauge. 

Here are some key differences you need to know before you buy a 2 gauge or 4 gauge.

2 Gauge vs 4 Gauge Battery Cable: An overview 

Features  2 Gauge 4 Gauge
Diameter  0.2576 inches or 6.544 mm 0.2043 inches or5.189 mm
Resistance  0.1563 Ω/kFT 0.2485 Ω/kFT
Maximum current (Amps) 95 75


1. Diameter 

AWG mentions the thickness of battery cables. The lower the gauge number, the higher the thickness. 1 gauge is thicker than any other gauge.

On the other hand, 2 gauge is thicker than 4 gauge. In comparison, 2 gauge has  0.2576 inches or 6.544 mm of diameter, and 4 gauge has 0.2043 inches or5.189 mm. 

The thicker gauge has a high conductive rate. Because of their high thickness, 2 gauge has low resistance and can transfer high current.

2. Resistance 

Resistance is another key factor to consider. Because of these two points–

  • High residence reduces the conductivity of current in a wire
  • Resistance generates heat while current passes through a wire. Sometimes, it generates excess heat to melt wire and insulators.

From the table, we know 2 gauge has 0.1563 Ω/kFT resistance, and 4 gauge has 0.2485 Ω/kFT. As 2 gauge is thicker than 4 gauge, 2 gauge has lower resistance than 4 gauge. 

3. Maximum Current Amps

Thicker battery cable can carry more current in high amps. But it’s not a big deal. You just need the right amount of current to jump-start your car. Perhaps, high voltage can burn your battery as well. 

In comparison, 2 gauge can carry more current as it is thick, to be mentioned 95 amps, and 4 gauge battery cable amp rating is 75

Gauge 2 Vs. Gauge 4: Which one is better?

Both of them are made for jumper cables, but they have different capacities. That’s why the thicker one (4 gauge) is perfect for a private car and has a less powerful battery. The 2 gauge is suitable for heavy load trucks and house-van and has a more powerful battery capacity. 

Both 2 gauge and 4 gauge wires can be connected to 12v batteries. But there are other points you may consider while purchasing. Length and outer insulation are common among them. 

In long wires, voltage drops due to resistance. So you don’t need to purchase excess wire unnecessarily. Outer insulation protects the wire from overheating and keeps it flexible in cold weather. 

Final Words,

2 gauge and 4 gauge are the most common wires to use in battery cable. Both of them are widely used according to their usage.  

I hope you may find this article useful in wire purchases. 

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