How do I know if my Infiniti Q50 battery is bad?
A failing Infiniti Q50 battery usually shows up as slow engine starts, dim or flickering lights, and warning lights on the dash. If you notice these signs, test the battery promptly to avoid getting stranded.
Recognizing common symptoms
Below are the most frequent indicators that a Q50 battery may be failing. They warrant prompt testing or replacement, especially if your car has a stop‑start system that often uses an AGM battery.
- Slow or labored engine cranking when starting the car
- Dim headlights or interior lights that brighten when the engine is running
- Battery or charging system warning light on the dashboard
- Electrical glitches, such as power windows or seat heaters acting up
- Corrosion on battery terminals or a swollen/bulging battery case
- Frequent need for jump starts or the car fails to start after sitting
- Battery age approaching or exceeding 3–5 years (AGM batteries can last longer in some climates)
Intermittent performance problems may also stem from a failing alternator or parasitic draw, but persistent battery-related symptoms are strong signs to test the 12‑volt battery first.
How to test the battery in your Infiniti Q50
Before relying on guesswork, perform or arrange a proper electrical test. A mix of quick checks and a formal load test provides the clearest answer about battery health and readiness.
- Inspect the battery visually: look for loose cables, corrosion on terminals, cracks, or swelling. Clean corrosion with a baking soda‑water solution and ensure terminal clamps are tight.
- Check the resting voltage with a multimeter when the engine is off. A healthy, fully charged 12‑volt battery should read about 12.6 volts or slightly more. Readings below about 12.4 volts suggest a discharged or weak battery.
- Start the engine and measure the charging voltage. With the engine running, the alternator should typically output about 13.8–14.4 volts. Readings consistently below this range may indicate charging system trouble.
- Perform a load test or have a professional perform one. A load test simulates starting in cranking conditions and checks whether the battery can maintain sufficient voltage (often above ~9–10 volts) under load for 10–15 seconds.
- Check for parasitic draw if the battery keeps dying when the car is not in use. A technician can measure draws when the vehicle is off; excessive draw (even a few hundred milliamps) can kill a battery prematurely.
If the tests show the battery is weak, failing a load test, or failing to hold voltage, replacement is usually recommended. If the alternator fails the charging test, addressing the charging system rather than the battery is the priority.
Differentiating battery issues from alternator or electrical faults
Some symptoms overlap between a bad battery and a bad alternator, so it’s important to distinguish the two to avoid unnecessary replacements. Here are signs that point toward the charging system rather than the battery itself.
- The battery light or charging system warning appears on the dash even when the engine is running
- Engine starts fine after a jump, but dies again once the jumper cable is removed
- Voltage reads within the normal range when the car is off but drops rapidly under engine load
- Electrical components fail intermittently while the engine is running, such as dashboard gauges or infotainment glitches
If you observe these indications, have the charging system tested in addition to the battery. A failing alternator or worn serpentine belt can mimic a battery problem but require different repairs.
Replacement options and maintenance tips
Understanding battery types and proper maintenance helps ensure reliable performance for your Infiniti Q50, especially if your vehicle uses a stop‑start system that often relies on an AGM (absorbent glass mat) battery.
- Choose the correct battery type and rating. If your Q50 has a start‑stop system, you’re likely dealing with an AGM battery. Confirm the OEM specification or consult a dealership or trusted auto parts store.
- Match cold‑cranking amps (CCA) and reserve capacity (RC) to your vehicle’s requirements and climate. A higher CCA is beneficial in cold weather, while RC affects how long the car can run accessories if the alternator isn’t charging.
- Have the battery replaced by a qualified technician if you’re unsure about the testing results. Proper installation—including terminal cleaning and correct torque—is important for longevity.
- Dispose of old batteries responsibly. Most retailers offer recycling and may provide warranty coverage depending on your purchase. Some batteries come with a pro‑rated warranty based on age and performance.
- Maintain the battery to extend life: keep terminals clean and tight, avoid parasitic draws when the car is off (lights, entertainment, and other accessories), and consider a battery maintainer if the vehicle sits unused for long periods.
With proper replacement and ongoing care, an original‑equipment‑quality battery can reliably power your Infiniti Q50 for several years, reducing the risk of unexpected breakdowns.
Summary
In short, watch for signs of slow starting, dim lights, and warning lights; perform voltage and load tests, and distinguish battery health from charging system issues. If the battery fails a test or shows significant age, replacement is typically the best course of action, especially for models equipped with stop‑start systems. Regular maintenance and professional testing keep your Infiniti Q50 dependable on the road.
How does a car act when the battery is going bad?
A car acts differently when the battery is going bad, primarily through a slow engine crank or a clicking sound when trying to start. Other symptoms include dimming headlights and electrical components, the check engine light coming on, and physical signs like a swollen battery case or corroded terminals.
Starting and electrical issues
- Slow engine crank: The engine turns over more slowly than usual, sounding sluggish.
- Clicking sound: A rapid clicking or whirring noise occurs when you try to start the car because the battery doesn't have enough power to turn the engine.
- Dim lights: Headlights, dashboard lights, and interior lights may appear dimmer than usual, especially when the engine is idling.
- Electrical malfunctions: Power windows may operate slowly, or other electrical accessories like the radio could act erratically.
- Rough idling: The engine may have slight, momentary jolts or hesitations as it starts before the alternator takes over.
This video explains the symptoms of a bad car battery, including slow cranking and dimming lights: 57sFixITYouTube · Feb 9, 2025
Warning signs and physical damage
- Check engine or battery light: A dying battery can cause these warning lights to appear on the dashboard.
- Frequent jump starts: If you find yourself needing to jump-start your car often, your battery is likely failing.
- Swollen battery case: A bulging or swollen battery case can indicate that it is overheating and is close to failing.
- Corrosion: You may see a white or bluish-green powder substance on the battery terminals, which is a sign of corrosion.
- Unusual smell: A "rotten egg" smell can indicate a leaking battery.
What is the most common problem with Infiniti Q50?
Premature Brake Wear
This is especially true for Infiniti Q50 owners who don't engage in a lot of stop-and-go driving. Unfortunately, premature brake wear tends to be a common issue. Some people have reported their brake pads wearing out in less than 5,000 miles. Be sure to have this issue fixed as soon as possible.
How long does an Infiniti Q50 battery last?
four to five years
An INFINITI battery typically works well for four to five years before it needs a replacement. However, outside factors can shorten or extend its life span.
How to check battery on Infiniti?
You can even do it at home. Check the health of your INFINITI's battery by connecting an automotive battery tester to the positive and negative terminals. With the engine and all electrical loads turned off, the voltmeter should read around 12.65.
