Exeed VX Battery Drains Overnight: Chasing a Parasitic Draw

First, Let's Separate "Bad Battery" From "Something Is Draining It"

On the Exeed VX, an overnight flat battery almost always comes down to one of two things: the battery itself has aged out, or something in the car is still awake and eating current while you're asleep. A healthy 12V AGM battery in a fully locked, sleeping VX should settle to roughly 20–60 mA of key-off draw. Here's the part most owners miss — the car doesn't fall asleep instantly. Give it 30 to 60 minutes after locking before you trust any measurement, because the telematics box, head unit and gateway stay awake for a while by design. If you're seeing half an amp or more after an hour, that's not a battery problem — that's a parasitic draw, and it will kill a brand-new battery just as fast as the old one.

The Usual Suspects on This Platform

In my experience with the VX, the draw is rarely exotic. It's almost always one of these:

• Telematics / eCall module (T-Box) — the classic offender on connected Chinese SUVs. It fails to enter sleep mode and quietly pulls 200–500 mA all night.
• Infotainment head unit or amplifier staying powered because the CAN bus never goes quiet.
• Body Control Module (BCM) seeing a "door open" signal from a sticky latch, tailgate catch or hood switch, so it keeps waking the network.
• Aftermarket gear — hardwired dashcams, GPS trackers, alarm systems, ambient lighting kits. This is the number one cause I find on cars that were fine for a year and then suddenly aren't.
• Alternator with a leaking diode, which drains the battery back through the charging circuit.
• Battery current sensor (IBS) on the negative terminal reading wrong, so the charging system undercharges the battery and it never fully recovers.
• A tired battery — sulfated, internally shorted, or simply past four years in a hot climate. It holds surface charge but collapses under load.

What to Check First, in This Order

Don't start pulling fuses at random. Work from cheap to expensive: check battery state of health with a conductance or load test (a rested battery should read about 12.6V and hold above 9.6V while cranking), verify charging voltage at idle with lights and A/C on — you want roughly 13.8–14.6V — then scan every module for codes, because a module that won't sleep often logs one. Only after that do you hook up a clamp ammeter or a multimeter in series on the negative cable, lock the car, wait the full sleep delay, and read the draw. From there, the fuse voltage-drop method or a simple fuse-pull sweep will point you to the exact circuit in about twenty minutes. And if there's a dashcam or tracker wired in — unplug it first. Half the jobs I've done ended right there.

Is It Safe to Keep Driving?

Yes, as long as it starts and the charging system is doing its job — a parasitic draw won't make the car unsafe to drive. But don't treat it as a minor annoyance. Every deep discharge cycles the battery hard, and the VX is full of modules that hate voltage sag: expect random fault messages, lost adaptations, and eventually a no-start in a parking garage at the worst possible time. One genuine warning sign, though: if you smell hot plastic, see smoke, or the battery gets unusually warm while parked, stop driving and get it looked at immediately — that points to a short, not just a lazy module. Otherwise, get the draw found and fixed rather than throwing a new battery at it, because the new one will be dead in a week for exactly the same reason.

This material is AI-generated and for informational purposes only — it does not replace an in-person diagnosis by a qualified mechanic.