9 Myths About Car Batteries

What could be more unpleasant than when you rush to work, and your car battery dies. I am sure almost everyone has at least once had a situation like this. This can happen for two reasons: either because of negligence when we leave the lights on over night, or when we fail to properly maintain the battery and the condition of the battery erodes over time until it completely fails. In the second case, we usually fall for an urban myth – a misconception about lead-acid Baterias de Auto a Domicilio Ñuñoa in cars. For this article I chose eight of the most common myths about these batteries and one truth at the end.

The eight myths are:


  1. Storing the battery on concrete pavement will discharge it
  2. Driving a car will fully recharge its battery under any circumstance
  3. On very cold days ignite the headlights to “warm up” the battery before starting the engine
  4. Lead-acid batteries have memory
  5. A higher capacity battery will damage the car
  6. Once formed, the car battery can not change its polarity
  7. A car battery will not lose power during storage
  8. Defective car batteries will not affect the loading or starting


All of these are myths and none is actually true. Let’s see why:

1.) Batteries in a wooden case (about 100 years ago) would really discharge when put on concrete. But since they are securely sealed in plastic containers now, there will be no unintended leakage.

2.) The second myth holds some truth in it, but it takes quite some hours of constant driving at highway speed to recharge a battery. In this case it is better to use a battery charger.

3.) You can actually warm up a battery by increasing consumption, but it will never be sufficient to ease starting the engine. Actually you might just use the last bit of power that would have started the car.

4.) There is no memory effect in lead-acid batteries. That’s why they work so well in cars. If they lose capacity it is due to aging cells or bad maintenance.

5.) The applications in the car will only use as much of the capacity as they need. A higher capacity does not do any harm.

6.) When completely unloaded a car battery can reverse its polarity during the initial recharge.

7.) It is normal for a car battery to discharge at a rate of 1-25% per month.

8.) A weak or defective battery can affect the charging and the starting. If you replace the battery, alternator, voltage regulator or power, make sure all components are in good condition.

The problem with these myths is, that when we take them serious, we are likely to maintain the battery badly. And, an improperly maintained car battery will have a shorter battery life and might suddenly die on you. Bear in mind that you should follow the manufacturer instructions.

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