2018 Q50 Battery Draining Fast - Charging System Warning Light On

ClearTheCode guidance (Infiniti · Electrical & electronics)

Summary: For 2018 Q50 Battery Draining Fast - Charging System Warning Light On, work through these steps on your 2016+ vehicle:

1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
5. Test the common fix — follow model-specific service procedures; one change at a time.
6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone,

I'm having a persistent issue with my 2018 Infiniti Q50 3.0t Luxe. Lately, the battery seems to be draining really fast, especially if the car sits for a day or two. I've had to jump-start it a couple of times already.

To make things worse, the charging system warning light has started coming on intermittently while I'm driving. It usually pops up after about 15-20 minutes on the r…

This is educational guidance, not a substitute for hands-on diagnosis.