The Maserati that couldn't even be unlocked.

This Maserati GranTurismo Modena belongs to the founder of QZ — and the experience at the root of the whole product happened to him on this car. After a longer period parked, the 12V battery was so deeply discharged that the car would not unlock: the door had to be opened with the physical key, and only through it could the bonnet be reached. Then came the second surprise — an ordinary charger refused a battery that flat; it simply did not respond. It took a professional Bosch workshop charger, borrowed from a friend's garage, to bring it back. Since then a CTEK that can handle deeply discharged batteries lives in the garage — and QZ lives on the battery, so it can never happen again without warning.

The same car then carried the pre-production version of QZ. On 6 April 2026 at 22:53 it sent an alert: “The battery is in a serious state.” The voltage had dropped to 11.94 V — the zone where a successful start is no longer guaranteed and the battery begins to suffer permanent damage. All the while, the car sat in its garage and from the outside everything looked fine.

A charger went on the battery that same night — the chart shows the immediate jump. A day and a half later, though, the voltage was falling again and QZ sent a second alert. Two warnings in three days told a clear story: the battery wasn't merely flat, it was reaching the end of its life. The replacement happened calmly and on schedule — not one morning at a car that no longer answers the remote.

The classics. With a 1965 Mercury Comet and a 1969 Alfa Romeo 1300 GT Junior, the founder more than once missed a trip — the battery had quietly drained over weeks of sitting, and it showed only at departure. On a weekend, with the battery shops closed, nothing could save the outing.

The AMG GT 63 arrived on a flatbed, immobile. The transporter left the car unlocked during transport — and an unlocked car in motion never sleeps: it keeps registering vibration and movement, holding its sensors and systems on standby, draining many times faster than an unlocked car sitting still at home. It was winter, too, when cold saps a battery's strength — within three hours it was flat. Trying to rescue the handover, he attempted a recharge — unsuccessfully — and then a jump start: the control units woke in the wrong order, the gearbox locked and a fuse blew. Friday evening, workshops closed. The fuse was not in stock and the car needed a full diagnostic pass — delivery slipped by ten days.

The GLS 400 and its auxiliary heating. Several winter mornings: a heating command, and the reply "12V battery insufficiently charged". A feature paid for in full, unusable at the very moment it was needed — with no warning beforehand.

A weak 12V battery rarely ends with just a car that will not start. It takes weekends, blocks equipment you paid for, and can set off a chain of repairs.

This is exactly QZ's job: watching the battery around the clock, understanding its chemistry, and speaking up before it's too late — and only when it really matters.