Battery Chargers

Buying a battery charger is cheaper than a new battery every two years: anyone who leaves their car, motorcycle, camper, or boat standing still for a long time lets the battery slowly drain — and deep discharge is exactly what ruins batteries. At Strex, you can compare smart 12V and 24V chargers, from compact trickle chargers with LCD displays to 25-amp industrial chargers for heavy-duty work.

Which battery charger suits your vehicle?

The logic behind it: the larger the battery and the faster you want it full, the more amperage you need. But for storage, the opposite applies — you want a low, constant current that keeps the battery at optimal levels for months without overcharging. That is why one household often has two chargers: a fast one for "needed now" and a trickle charger for "getting through the winter."

What exactly does a trickle charger do?

A trickle charger (also known as a maintenance charger) gives the battery a small amount of current at a time — just enough to compensate for natural self-discharge. Modern smart chargers continuously measure the battery voltage and automatically switch between charging and maintenance: connect in October, disconnect in March, and the engine starts as if it were driven just yesterday. Meanwhile, the LCD display shows voltage and charging status, so you know at a glance whether everything is healthy.

What should you pay attention to when choosing?

• ✔ Voltage — 12V for car and motorcycle; 24V also for trucks, buses, and large equipment
• ✔ Charging current (A) — more amps charge faster; for maintenance, less is actually better
• ✔ Battery type — AGM and lead-acid batteries also require a charger that supports that type, especially with start-stop cars
• ✔ Repair mode — can often resuscitate a deeply discharged battery before you buy a new one
• ✔ Display — reading voltage without a multimeter saves guessing

The winter storage mistake that destroys batteries

Most batteries die not from driving, but from sitting still. An uncharged battery loses part of its voltage every month; if it drops too low, the plates sulfate and the capacity never fully returns. The solution takes one action: connect a trickle charger the day the vehicle goes into storage. If you are in doubt about whether the battery is already damaged — it starts slowly, or the voltage drops quickly — then measuring first is wise: with a multimeter or OBD2 scanner, you see the condition in black and white. And if the battery fails on the road anyway, a jump starter will always get you home. You can find more at auto & mobility.

Frequently asked questions

How long does it take to charge a car battery?

Rule of thumb: battery capacity divided by charging current. An average 60Ah car battery is full in roughly 8 to 10 hours with an 8A charger — that is, one night. With a 25A industrial charger, it goes significantly faster; for maintenance charging, speed is not a goal.

Can I leave the charger connected without disconnecting the battery?

Yes, with a smart charger with a maintenance mode: it monitors the voltage and switches back automatically as soon as the battery is full. Disconnecting the battery is not necessary for normal maintenance charging — convenient, as the onboard computer and settings remain preserved.

What is the difference between a battery charger and a trickle charger?

A regular battery charger is made to quickly fill an empty battery; a trickle charger keeps a full battery at optimal levels for months with a minimal current. Smart chargers combine both: charge first, then automatically switch to maintenance.

Is a trickle charger suitable for my motorcycle or scooter?

Yes — motorcycles and scooters in particular sit still the longest and have relatively small batteries, which deep-discharge faster. A trickle charger during winter storage is the most effective way for two-wheelers to be able to start immediately in the spring.

Check out the Strex battery chargers — from trickle charger to 25A industrial — and never let inactivity cost you a battery again.

Want to know more? Read our article "Choosing a battery charger: trickle charger or fast charger?".