Comparison

Battery monitoring that works when you're not there

A €30 Bluetooth monitor shows voltage when you stand next to the car. QZ reports over 4G wherever the car parks — and warns you before the car won't start.

See QZ pricing →

Where a Bluetooth monitor stops

For the money, a Bluetooth monitor is a decent tool: at the car, it shows you the voltage. Its limit is structural — roughly 10 metres of range, and you have to open the app yourself. Batteries tend to die exactly when you're away.

Range of about 10 m — a car in an underground garage or another city is simply out of reach.
No unprompted alerts — you have to open the app yourself, near the car.
A car in winter storage or parked at the airport goes unwatched for weeks.
A maintenance charger keeps the battery full, but it needs a socket — and tells you nothing remotely.

How QZ works

Clamp it to the battery postsTwo terminals, plus and minus. No CAN bus, no OBD, no wiring into the car — warranty-safe. Installation takes about 10 minutes.

It reports over 4GSIM and connectivity are included in the price. QZ sends data from anywhere with even weak mobile signal — underground garage, another city, winter storage. In Storage mode it draws about 5.3 mA, roughly 1.5% of a 60 Ah AGM battery per week.

You get a plain-language verdictThe app speaks in conclusions, not raw numbers — for example, "battery needs charging before the weekend". A push notification arrives before the car won't start.

A real case from our fleet

A Maserati in our fleet: QZ flagged the weakening battery days ahead as the voltage slid to 11.98 V. The owner replaced it calmly, before being stranded. That is one real story, not a guarantee — but when a battery weakens gradually, QZ typically warns days in advance.

Common questions

Why pay €199 when a Bluetooth monitor costs €30?
If the car sleeps in your own garage and you check it weekly, the €30 device is fine — we say that plainly. QZ is for what that device structurally cannot do: watching the battery when you are not there. 4G reporting, the SIM and the first year of service are included from €199.

I'm not comfortable installing electronics in my car.
It's two clamps on the battery posts — the same operation as connecting a charger. No cut wires, no CAN bus, no OBD. About 10 minutes.

My garage is underground — will there be signal?
QZ needs only ordinary mobile signal, not Wi-Fi or Bluetooth. If your phone gets any signal in the garage — even weak — the device connects. Underground garages are exactly where a Bluetooth link with roughly 10 m of range cannot help at all.

Will it void my car's warranty?
No. QZ connects only to the battery posts — it never touches the CAN bus, the OBD port or the vehicle wiring. From the car's point of view, it is the same connection as a maintenance charger.

See QZ pricing →

From €199 one-time, including the first year of service. Details in the pricing section.

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