Know your battery is fading — while there is still time to act
QZ watches your car's battery remotely over the mobile network — wherever it is parked. When the battery weakens, you hear about it early, in plain words.
The battery fades quietly while the car sits
A premium or seasonal car spends most of its life parked. That is exactly when the battery is most vulnerable — and unwatched, it weakens without a single warning.
- The alarm, telematics and standby systems keep drawing power after you lock the car.
- A convertible, classic or weekend car sits for months over winter while the battery quietly loses capacity.
- The first sign of trouble usually arrives the moment the car will not start.
- Bluetooth monitors reach only a few metres and work only when you open the app next to the car.
How QZ works
This is what it looks like in the app
No raw data, an answer: “Everything under control”, “Watching” or “Battery needs attention” — per vehicle, with the resting voltage, the last days’ trend and the car’s parked drain.
Recorded from the live app on two real vehicles, no sound.
A real case: the founder's car
The founder's Maserati began showing a weakening battery — the voltage gradually fell to 11.94 V. QZ flagged it days in advance, and the owner replaced the battery before being stranded. One case is not a guarantee — but when a battery weakens gradually, QZ warns early — in this case, days in advance.
Common questions
Why not a €30 Bluetooth monitor?
A Bluetooth monitor works only within about 10 metres, and only when you open the app next to the car. QZ reports over the mobile network from anywhere — an underground garage, another city, winter storage. Pricing from €199 incl. VAT today covers the device, the SIM card, connectivity and the first year of service.
Will installation affect my car or its warranty?
No. QZ connects exclusively at the battery — no CAN bus, no OBD, no wiring into the car. Warranty terms can vary by manufacturer and vehicle — QZ, however, does not touch the car's electronics. Installation takes about 10 minutes.
I park in an underground garage. Will it work?
QZ communicates over the mobile network, not Bluetooth. It reports from anywhere at least a weak phone signal reaches — underground garages included.
Won't QZ drain the battery itself?
In normal operation it draws a few mA (the manufacturer states 5.3 mA in sleep). On our bench a small 14 Ah motorcycle battery, taken off its maintenance charger, went from 100 % to about 85 % in 12 days with QZ connected — on a typical 60 Ah car battery that is roughly 2 % per week. And as the voltage falls, QZ tells you. It is designed for cars that sit for months at a time.
€199 incl. VAT — device, SIM, data and the first 12 months of service. Shipping €5 (for now we deliver to Slovakia only), ships within 3 business days. Then €49/year, renews automatically, cancel any time.