Why does my Infiniti QX80 keep killing batteries or not start?

Short answer: Owners blame repeat dead batteries and random no-starts on the QX80's smart charging system (VVCS), which can leave the battery undercharged, especially with short trips. Before you buy another starter, check whether a jump always gets it going; if it does, the battery side is the likely problem. Longer drives, a trickle charger, and having a shop check charging voltage help. Some owners unplug the smart charging sensor, but ask your mechanic first since it changes how the truck charges.

Symptom: The truck clicks or won't crank now and then but starts fine with a jump. Batteries die early, or the truck is dead after sitting.

What to check first

1. Notice whether a jump always starts it. If so, focus on the battery and charging, not the starter.
2. Have the battery load-tested and the charging voltage measured with the engine running.
3. Think about how you drive it: a few short trips a week is the pattern owners describe.
4. Use a trickle charger if it sits for days.
5. Run your VIN at nhtsa.gov/recalls and ask the dealer about charging-system bulletins.

Likely causes

1. Smart charging system undercharging the battery. The QX80 uses a Variable Voltage Control System (VVCS) that lowers alternator output to save fuel. Owners say it can leave the battery undercharged, especially with short trips. A sensor on the negative battery cable tells the system how full the battery is.
2. Short trips and long parking. Owners say the trouble shows up mostly when the truck only makes a few short drives a week.
3. Starter. The starter sits under the intake manifold. If a jump starts it right up every time, the battery or charging side is the more likely problem.

What it usually costs

Owners in these threads replaced batteries and one replaced the starter, but didn't post prices.

Is it safe to keep driving?

It's a reliability problem more than a driving hazard, but a truck that won't start can strand you. Carry a jump pack until it's sorted.

DIY or shop?

Battery replacement, a maintainer and voltage checks are DIY. The starter under the intake manifold and charging-system diagnosis are shop work for most owners.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists 7 recalls for the QX80 in these years, and none is about charging or dead batteries. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 18 keyword-matched complaints for Infiniti QX80 2014–2024 (of 119 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-31; keywords: battery, dead, won t start, no start, charg, alternator). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 2022-2024 QX80 still battery charging problems or no? on Reddit r/infiniti, QX80 owners talked about the well-known battery charging problems on 2018-2021 trucks, where the smart charging barely charged while driving and batteries died early. Several said they unplugged the smart charging sensor on the negative battery cable so the truck charges like a regular car, and asked whether 2022-2024 models still do it.
• In 2017 Infiniti QX80 - Intermittent Start Issues on Reddit r/MechanicAdvice, a 2017 QX80 had about 7 or 8 no-starts in a year. The owner replaced the battery and then the starter, but it still happened, and a jump always started it. Commenters pointed to the VVCS smart charging, especially with short trips or fewer than three drives a week, and suggested a trickle charger.

Quick tip

If a jump starts it every time, stop buying starters. Test the battery and charging system, and give it a longer drive or a maintainer.

Vehicle focus: Infiniti QX80, 2014-2024, 5.6-liter V8.

Safety / mechanic note

No-starts can leave you stranded. Verify with a mechanic.