Hello, welcome to Kennedy Transmission Brake & Auto Service. Today’s focus is batteries. It seems like everything in Minnesota runs on batteries. Of course, the batteries we’re most concerned with here at Kennedy Transmission Brake & Auto Service are those in our customer’s vehicles. Just like the batteries in our smoke detectors or TV remote, car batteries wear out and need to be replaced. There are a couple of things Minnesota drivers should know when looking for a new battery.

Look for two measurements that come into play: cold cranking amps and reserve capacity.

Let’s start with cold cranking amps. Battery Replacement At Kennedy Transmission Brake & Auto Service This can be thought of as the power output used to start a cold car or truck engine. The number of cold cranking amps you need depends on your vehicle and where you live in North Dakota , specifically how cold it is. (Many North Dakota car owners have first-hand experience trying to start their car on a cold winter morning.) The two factors are that the colder your car or truck’s engine is, the more power it takes to turn the engine over to get it started. It has all that cold, sluggish oil to contend with.

The other factor is that the chemical reaction in the battery that creates electrical energy is less efficient when the temperature dips. At Kennedy Transmission Brake & Auto Service, we consult the table shown below. Let’s say it’s eighty degrees Fahrenheit in Minnesota. At that temperature, 100% of the battery’s power is available. At freezing, only 65% of battery power is available, but it requires 155% as much power to start the engine as it did at eighty degrees.

As you can see from the chart, the colder it gets, more power’s needed, but the available power drops.

Percent of Power Available Celsius Fahrenheit Power Required  
100 27 80 100  
65 0 32 155  
40 -22 0 210  
25 -32 20 350  

So if you live where it’s cold in North Dakota , you need a battery with more cold cranking amps than you do where it’s moderate or hot. The battery that originally came with your car or truck was based on averages. At Kennedy Transmission Brake & Auto Service, we like to remind Minnesota drivers that they should always get at least as many cold cranking amps as their manufacturers recommend, but may want to upgrade if they live where it gets real cold.

And the type of engine you have will impact the battery you need: A six-cylinder engine requires more cold cranking amps than a four. An eight cylinder needs even more. And diesel car or trucks require more than a gasoline engine with the same number of cylinders.

Now on to reserve capacity: It’s a measurement of the number of minutes of reserve power the battery has at a given load. The number is more important to Minnesota drivers these days because of parasitic drain. Parasitic drain is the battery energy that’s used when the key is off in your car or truck. So, the power drawn by the security system, the remote start system, even the power the computers require to maintain their memory.

Reserves are also needed when you make very short trips around Minnesota. You’re not driving long enough for the battery to recover the energy it used to start the engine. So go with the minimum recommended by your manufacturer or Kennedy Transmission Brake & Auto Service and upgrade if you need more.

Talk with us at Kennedy Transmission Brake & Auto Service about your options. If you need more from your battery, a larger, heavy-duty battery may be called for. At Kennedy Transmission Brake & Auto Service in Minnesota, we remind our customers that it’s very important that the new battery fits your car or truck: the terminals can’t be touching other parts.

Batteries are a big ticket item for most North Dakota drivers, so the warranty gives piece of mind. There’re two kinds of car battery warranties: pro-rated and free replacement. With the pro-rated, you get a credit for a portion of the battery if it fails during the warranty period. With a free replacement warranty, you get just that, a free replacement. Be sure to ask us at Kennedy Transmission Brake & Auto Service about the warranty so you know what you’re getting.

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