The car stood in a garage for 15 days. The Connect module quietly loaded the 12V battery. QZ caught the risk before it became a no-start at the worst moment. Result: no morning surprise, no tow, no unnecessary stress.
Early access · first batch 2026
Starts.
Or it doesn't.
A small device with its own SIM, connected to your 12V battery. It watches around the clock — even while the car sleeps in the garage — and warns you days ahead, before it leaves you stranded. For premium cars, seasonal machines and small fleets.
Get QZ for my car →QR activation · web app on phone · 4G LTE included
€199 incl. VAT
year 1 service included
then €49 / year
Private and business, from 1 vehicle · better per-vehicle price with more vehicles · EU B2B with VAT ID: no VAT
A 12V battery is the #1 cause of car breakdowns.
According to ADAC, in 2025 the 12V battery caused 45.4 % of all roadside breakdowns. Not the engine. Not the gearbox. Not the electronics. The battery.
45.4 %
12V battery
ADAC · 2025
45.4 %Starter battery (12V)
21.8 %Engine / injection / HV system
10.4 %Alternator / starter / lighting
8.9 %Tires
6.8 %Keys, locks, immobilizer
6.7 %Other (body, brakes, chassis)
- → The battery usually warns in its data — nobody is watching it.
- → Everything looks fine the day before
- → You only find out when it's too late
QZ is built for exactly this moment.
QZ doesn't fix every possible battery failure. It addresses the most important moment: timely warning before a no-start.
Source: ADAC Pannenstatistik 2025 →Every unit lab-calibrated.
±15 mV accuracy across the range, lab-verified for every unit. Cheap voltmeters typically spec a tolerance in the tenths of a volt — and that is the line between a healthy and a damaged battery.
12 months of service included.
No hidden monthly fees in the first year.
Works wherever there is signal.
Own SIM included — no phone pairing, no 10-metre Bluetooth leash.
A monitor shows you a number. QZ tells you a decision.
A regular voltmeter shows the voltage. QZ watches the battery's behaviour over time and translates it into one simple action. Four states. Nothing more.
OK
Nothing to do.
WEAKENING
Voltage is dropping faster than usual. No action yet.
CHARGE
Charge today or drive 30+ min continuously.
CRITICAL
It may not start tomorrow. Act now.
Concretely: instead of "12.35 V", QZ tells you "Battery spent 48 h below its healthy zone — charge today." One number that drives action — not a graph to decode.
This is what lands on your phone
QZ
kyuzet
7:14
GT4RS — battery needs attention
Voltage has been dropping for three days. Charge before the weekend — or risk a cold no-start on Monday morning.
No chart to decode. One sentence, one action — days ahead.
What you physically get
One small device connected to your 12V battery. Mobile network included. Web app on your phone. Notifications only when there's something to do.
1
Device on the battery
Connects to the + and − terminals of the 12V battery. Typical install ~10 minutes. 4G LTE included — no separate monthly fee for connectivity. For hard-to-reach batteries we recommend workshop installation.
2
Mobile notification
You get a push only when there's something actionable. No daily spam, no graphs, no FYI updates.
QZ — Tesla Model 3
Charge today. Risk of failed start rising.
3
Plain explanation
Web app on your phone (no App Store) shows status and a short explanation — no technical jargon.
State: CHARGE
Car has been parked for 9 days. Voltage dropping faster than usual. Charge today or drive 30+ min.
How it works
1
Connect it to your battery
→
2
QZ detects the risk
→
3
You get alerted before it's too late
Activation walks you through step by step. After that, only alerts when there's something to do.
Video · 26 s
Real recording of the QR activation (26 s). The app runs in English, German and Slovak.
The QZ device before installation — connects to the + and − battery terminals, typically ~10 minutes.
Who it's for
✓Cars that stand still
Weekend cars, classics, convertibles, motorcycles and campers. Garaged for weeks — and they must start on the day it counts.
A season without surprises.
AGM with neglect: 2–3 years · with proper care: 5–7 years. (VARTA Service Manual, Yuasa VRLA Storage Guide)
Plus: no lost morning at the start of the season.
✓Premium cars with Connect modules
Luxury and performance vehicles that quietly lose voltage while sitting still. Parasitic drain is higher than you think.
A premium car deserves more than a green icon.
Premium AGM €280–€450 · BMW/Audi dealer install + OBD registration €100–€150.
On a premium car, one avoided failure can cover the cost of QZ for years.
✓Businesses with 1–20 vehicles
Dealerships and showrooms, workshops with courtesy cars, rentals, delivery. Each morning you see which car needs charging — before you hand it to a customer. Online checkout, no sales calls; for 21+ vehicles we start with a pilot.
One weak battery can stop a whole day.
For 20 vehicles, typically 5–7 failures/year (€430–€1,800 per event).
QZ pays for itself when 2–3 such mornings are prevented.
✗A daily driver without any issues
If you drive 30+ min every day and the battery has never failed — this adds less value for you.
Real situations
The car stood at the shop with doors open for too long, not on charge. Battery dropped critically low. The mechanic had no idea. QZ warned in time — I called the shop before the battery died completely.
Result: no delay at handover, no jump cables, no apologetic explanation to the customer.
One van doesn't start. Another vehicle is used to jump it. Now both are delayed — and a customer pickup goes south.
QZ should give the fleet manager time to act a day in advance — not deal with chaos at 6 AM.
First sunny day. You want to ride — battery is too low. The day is spent solving the problem instead of driving. QZ tells you a week in advance, while you can still top up calmly.
EU B2B with valid VAT ID → no VAT (reverse-charge)
Pick by vehicle count.
Single driver, multiple cars, or a small business — buy QZ instantly. Larger fleets start with a pilot.
1 vehicle · private or business
QZ One
€199incl. VAT
one-time + €5 SK / €10 EU shipping
- For one car, motorcycle or company vehicle
- Device + 4G LTE + first year of QZ Foresight included
- Web app + alerts + clear action recommendations
After year 1: €49 / year · cancel any timeEU B2B with VAT ID: no VAT
Buy 1 QZ →
2–5 vehicles · home or business
QZ Multi
€179incl. VAT / vehicle
multiple cars · classic · bike · company fleet · workshop · showroom
- Pick quantity in the checkout flow
- First year of QZ Foresight for each vehicle
- Private and business purchases with full invoice
After year 1: €39 / year / vehicleEU B2B with VAT ID: no VAT
Pick quantity →
6–20 vehicles · business
QZ Business
€159incl. VAT / vehicle
businesses · workshops · showrooms · rentals · small fleets
- Online checkout, no sales calls
- Company invoice with VAT ID
- Onboarding support as needed
After year 1: €29 / year / vehicleEU B2B with VAT ID: no VAT
Buy for company →
21+ vehicles · pilot
QZ Fleet+
custom
pilot, onboarding, multi-user, team rules
- Dedicated account manager + SLA
- Multi-user team dashboard (in development)
- Pilot on 5 problem vehicles first
indicative from €139 / vehicle · from €24 / year / vehicle by scope
Discuss a pilot →
Up to 20 vehicles: click and pay. Above 20: we start with a pilot to align deployment, billing and accountability.
Video · 25 s
First batch
The first units are already shipping.
No pre-order vapor. First-batch devices are being packed and shipped to their first owners — exactly as you see in the clip.
Short dispatch clip, muted.
Is your car in the risk group?
30 seconds. We'll be honest — even if you don't need QZ.
Powertrain
Does it have start-stop?
How often does it sit?
What trips do you mostly drive?
Indicative. QZ decides from real voltage, time and battery type. Risk sources: ADAC, VARTA, Yuasa.
A 12V battery rarely dies suddenly.
First, it spends too much time in a state that harms it.
QZ watches that.
A regular voltmeter shows you a number. QZ tracks whether the battery is spending too long in a state that's destroying it. If it is, you get notified in time — while there's still time to act.
- For lead-acid, EFB, AGM and GEL batteries, prolonged time in low state of charge can drive sulfation — gradual and ultimately permanent loss of capacity.
- For LiFePO4 batteries, QZ uses different logic — not sulfation, but low state, BMS protection and proper charging.
- Helps you act in time — recharge, connect a maintainer or check the battery.
The most expensive part isn't the battery. It's the morning the car won't start.
When the battery is healthy, a flat car often jump-starts from another one — for free. The problem isn't the few euros. It's that it always happens at the worst moment — before a client, before a flight, at the start of the season.
The moment
The car won't start exactly when you need it least. QZ tells you a day ahead, while there's still time to act calmly.
Battery life
Repeated deep discharge quietly destroys the battery (sulfation) — you pay for a new one sooner. QZ keeps the battery out of the state that shortens its life.
When it goes to the extreme: most flat batteries cost €0 (a jump-start from another car). When a failure ends in replacement — an ordinary car €60–150, a premium car (OEM AGM + battery registration at the workshop) realistically €400–700. For a fleet it adds up per standing day.
QZ isn't about saving a few euros on jumper cables. It's a timely warning so a weak battery doesn't catch you out at the worst moment — and a battery that lasts longer.
Price sources: public pricing of authorised workshops (BMW/Audi/Mercedes SK) 2026, replacement battery prices incl. OEM AGM, standard SK assistance and towing rates 2025. Actual costs depend on model, region and conditions.
Morning. Silence. Nothing.
You turn the key. No response.
Plans stop. Time runs.
This is the moment QZ detects earlier.
Not every battery fails the same way.
Flooded, EFB, AGM, GEL and LiFePO4 batteries have different risks. QZ distinguishes the battery type and watches what matters for it.
Lead-acid family
Flooded · EFB · AGM · GEL
Prolonged time in low state of charge can drive sulfation — hard crystals the battery can no longer break down. Capacity loss is permanent.
QZ watches: hours in the risk zone for each chemistry, discharge rate and temperature compensation.
Lithium chemistry
LiFePO4
Different chemistry, different rules. LiFePO4 doesn't sulfate, but is sensitive to deep discharge, BMS cutoff and improper charging. It must not be charged below 0 °C.
QZ watches: low state, BMS protection, suitability of charging cycle.
Sources: VARTA Service Manual, Yuasa VRLA Storage Guide, Battery University BU-806 (sulfation), Power-Sonic LiFePO4 Charging Guide, OPTIMA Batteries specifications.
For EVs too.
Every car — combustion, hybrid or full EV — has a 12V battery. And it's the single most common reason an EV ends up stranded.
~50 %
12V battery
ADAC · EV
50 %12V auxiliary battery
18 %Motor / drive / HV system
13 %Tyres
10 %Generator / starter / electrical / lighting
3 %Locks / immobiliser
6 %Other
In EVs the 12V battery is an even bigger share of breakdowns (ADAC callouts) than in combustion cars (~45 %) — though EVs break down less often overall (fewer callouts per 1000 cars). Source: ADAC, EV breakdowns 2024.
When the 12V dies, the car won't wake
In an EV the 12V powers the locks, screens and the relays that even connect the big traction battery. When it drops, the car may not open or "wake" — sometimes not even connect to charge. While parked, sentry and telematics features quietly drain it.
What QZ guards today
QZ connects to the 12V auxiliary battery's terminals — regardless of powertrain — not the high-voltage traction battery. It measures voltage, knows the chemistry (lead-acid and LiFePO4) and warns before it strands you. Protection against a flat 12V works from day one; deeper EV-specific logic (DC-DC charging patterns) is still being validated on real cars.
On top
We watch your deadlines too
QZ is first and foremost a battery guardian. As a bonus, add your inspection, insurance or vignette and QZ notifies you ahead of time as a deadline approaches — a month before and again just before — so nothing slips. Optional, you don't have to use it.
Real case · QZ pilot program
The Maserati that wouldn't have started the next morning.
A Maserati GranTurismo Modena sat in its garage, and from the outside everything looked fine. QZ, however, saw the EFB battery's resting voltage drop to 11.94 V — a critical level at which the car would not start in the morning. At 22:53 that evening it alerted the owner, and the charger went on the car that same night.
Read the full story →Who is behind it
QZ was born out of personal frustration.
I love cars and motorcycles — from modern performance models to classics — and I kept running into the same problem: the car was supposed to be ready, and it wasn't. I tried battery monitors, but most of them ended at a Bluetooth app and a number that tells you nothing.
So I built QZ. Behind it is the Slovak company OOZI s.r.o., it runs on Teltonika industrial telematics, and the data stays on servers in the EU, in line with GDPR.
When you write to us, it's not an anonymous system that answers. It's a person who spent years dealing with this exact problem on his own cars.
Oskar Malatinskýfounder of QZ
For 21+ vehicles · QZ Fleet+
Don't start with 50 cars. Start with 5 problem ones.
For larger fleets we need to align deployment, billing and accountability. We set up the pilot on 5 vehicles that sit, drive irregularly or cause morning chaos. After 30 days we evaluate alerts, interventions and real impact.
Fleets
Morning chaos disappears when you know a day in advance which vehicle will fail.
Workshops
The customer car in service won't die from a battery. No apologetic handovers.
Dealerships
Demo and stock cars start whenever you need them.
For 1–20 vehicles you don't need to wait for a pilot — buy QZ directly from pricing above (click-and-pay).
The greenest battery is the one you never have to make.
When a battery lasts longer it's not just less expense — it's one more battery that never has to be made or re-smelted.
Lead-acid batteries are ~99 % recycled in the EU — but recycling isn't free. Collecting, hauling across Europe, smelting and refining the lead, and safely handling hazardous residues all burn energy and produce emissions. Doubling a battery's life halves that burden.
For fleets, QZ can turn that into a concrete year-end number — how many batteries timely care let you avoid replacing. Input for your ESG report.
At an average ~20 kg battery (~60 % lead), every premature failure is material that didn't need to be made and re-smelted — a "recycling footprint", not landfill waste. Sources: EUROBAT, CORDIS (secondary lead), MDPI lead-acid LCA 2025.
Built on
Professional telematics
·
4G LTE included in the device price
·
no Wi-Fi or phone pairing
Questions you have
I'm not a technical person. Can I do this?
Two cables to the battery. 10 minutes. Or we'll help you.
Do I need an app on my phone?
No app from the App Store or Google Play needed. QZ works as a web app on your phone and walks you through activation. You only get important notifications.
What if I don't like it?
For online purchases you have 14 days to return without giving a reason. You can reasonably test the device to verify it works. If visibly worn or damaged from installation, the refund may be reasonably reduced.
Does it need Wi-Fi or my home network?
No. Mobile network (4G LTE) is included in the device price — no separate monthly fee for connectivity. After year 1, active alerts require a service renewal (€49/year for QZ One).
Does it work in underground parking?
Connection quality depends on the cellular signal at your parking spot. If your phone has signal there, QZ will most likely work. If the garage has no signal at all, the device sends data once the connection is restored.
Does QZ drain the battery itself?
Device (FTC880) own consumption adapts to the vehicle profile:
• Storage (long idle): ~5.3 mA average — about 1.5% of a 60 Ah AGM per week (under 7% per month).
• ECO (occasional driving): ~12 mA.
• Active (daily use): ~25 mA, recharged while driving.
For reference: a typical car's standby draw (alarm + control-unit wake-ups) is 30–80 mA. QZ is 6–15× lower.
For small motorcycle batteries (12–14 Ah) we recommend Storage profile during seasonal idle.
• Storage (long idle): ~5.3 mA average — about 1.5% of a 60 Ah AGM per week (under 7% per month).
• ECO (occasional driving): ~12 mA.
• Active (daily use): ~25 mA, recharged while driving.
For reference: a typical car's standby draw (alarm + control-unit wake-ups) is 30–80 mA. QZ is 6–15× lower.
For small motorcycle batteries (12–14 Ah) we recommend Storage profile during seasonal idle.
Does QZ replace a workshop battery test?
No. QZ tracks the battery's behaviour in real life and warns about risk. A workshop can precisely measure CCA (load test), parasitic draw and remaining capacity — QZ doesn't. If QZ shows repeated weakening, we'll recommend a workshop check.
I'm VAT-registered — how do I enter my VAT ID?
At checkout, click „Add Tax ID", pick your country from the dropdown (SK/CZ/DE/AT/…), and enter only the number, without the country prefix. For example, for DE123456789 type only
123456789. EU B2B reverse-charge is verified via VIES and applied automatically — no Slovak VAT.Not sure?
Write to us — we'll help you decide before ordering. support@kyuzet.com
Don't guess if your car will start.
A single battery problem often costs more than just the battery: tow, delay, workshop, cancelled plan. For premium cars and fleets the real loss is many times the device price.
Get it for my car →