Why Does My Car Battery Keep Dying – Reasons And Solutions

Why Does My Car Battery Keep Dying

It must be unsurprising that if you let your automobile idle for several days, this may not ignite when you want to drive it. It could be due to a flat battery. But, even if you’ve got a brand new automobile or use it often, you may encounter the same problem. To resolve the situation, you have no option except to call the closest urgent roadside help provider. You begin to wonder why does my car battery keep dying.

Your automobile battery might exhaust for a variety of reasons. However, understanding what is causing the issue may help you prevent a vehicle breakdown on a chilly winter morning. This guide will demonstrate the most frequent causes of a drained battery.

Read more about why your vehicle battery isn’t retaining a charge.

An automobile battery essentially gets used at the start of combustion, where it assists in delivering the first zap of electricity to start the vehicle. After this, the car does or doesn’t depend on the battery for additional power, but it will utilize it as a backup source if it is not in movement.

In either event, the electricity consumed by the car recirculates into the battery via the dynamo, keeping it charged and ready for use. The alternator provides power to the battery, opposing its chemical process and refilling the battery.

This procedure is fairly effective, and you do not have to recharge the battery too frequently. However, if your battery continues failing regularly, there might be several factors to investigate. Let’s look at why does my car battery keep dying.

Why does my car battery keep dying? 

Here is a variety of potential causes for your battery to continually die.

Parasitic Drainage

It is just the discharge of an automobile battery after the engine is off. It is frequently the result of an electrical fault or a cabling fault. Some power supplies inside the automobile fail to close down, resulting in this continuous use of the vehicle battery.

Monitoring for this form of battery draining is critical since it may gradually but steadily deplete your automobile battery. It might suggest a faulty battery placement or a burst fuse in the power system.

Alternator Failure

When you start the engine and the battery disconnects, the dynamo entrusts with charging the battery with mechanical energy. Alongside filling the battery, the dynamo maintains every electrical device in the vehicle running, such as the lighting, entertainment system, Conditioning, etc.

If the dynamo has a bad diode, it would not be possible to charge up the battery adequately. Its poor efficiency will reflect in the failure of other electrical components in the automobile. Whereas electrical components operate well while running but fail when you start driving, it might be due to a faulty dynamo.


It is arguably the primary cause of nighttime battery depletion. We could all agree to fail to switch off the headlights after a late-night excursion. Any other power use may leave the vehicle battery undercharged, so we recommend that the external and internal lights get left on for over 5 hours.

In contrast, a brightly lit car for 10-12 hours is sufficient to drain all the energy from the battery. Many new automobiles currently have a headlight warning function, and several even have auto-deactivation capabilities.

But, it would be best if you never forgot to verify whether the lights are on since discovering a flat battery. At the same time, you’re tardy is never enjoyable.

Charging flaws

Churning the engine consumes significant battery power. The charging mechanism recharges the battery using mechanical energy from the running automobile. The primary cause of the reduction in recharging pace is worn-out straps and tensioners.

Battery Cable Corrosion

The battery wires are how power transfers from the batteries to the automobile. Suppose these positively and negatively connections are rattled away or corrupted. (https://mgtrailer.com/) In that case, the continuous passage of energy gets hampered, resulting in diminished battery power.

Loosen connections get often induced by the battery’s movements, shocks, and shaking, typically produced by an irregular and rough highway. In contrast, oxidation of the connections may produce by either overloading or a discharge of hydrogen from the hydrochloric acid in the battery’s liquid.

Corrosion or poorly fastened connections may result in various issues ranging from failure to ignite the engine to flashing lights and even damage to electrical systems. We suggest inspecting the battery connections every 2-3 months and maintaining the battery correctly.

Small Trips

The dynamo recharges the battery at a constant rate, whereas the engine is functioning after turning engine. But, if the motor gets shut off for a particular timeframe, which is insufficient for the battery to restore the power it has shed, the life of a vehicle battery may get reduced.

At a minimum, we recommend one lengthy excursion to refill the battery entirely within a week or two.

Severe Temperatures

Cold and hot temperature extremes may both impair your battery’s charge capacity. They can be a big reason for your query of why does my car battery keep dying. Maximum and minimum temps trigger the production of sulfate particles in the battery, which spreads throughout the system and creates chaos.

Heat may stretch the battery out of proportion if left for an extended time. In contrast, cold can reduce the battery’s power capability. We suggest preventing severe temperature exposures as feasible to prevent rapid depletion of your automobile battery.

Parking in the shadow during the summertime and often traveling for considerable distances during the winter assist in mitigating the impacts of the climate.

Bottom line

So, several factors affect the effective operation of our automobiles that a bit of caution and precaution on our side may go a considerable far. We believe now you are ready to deal with any battery issue through this comprehensive list of items.

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