Lead-acid batteries are used for standby power and for replacing worn batteries in uninterruptible power supplies (UPS), alarm systems, tills, emergency lighting and similar equipment. Our range includes over 40 models, with products from YUASA, GREENCELL, FIAMM and QOLTEC among others.
How to choose a lead-acid battery
Voltage. Most lead-acid batteries are 6 V or 12 V, and the voltage must match the battery you are replacing. Higher voltages are reached by connecting batteries in series, which calls for identical models bought at the same time.
Capacity (Ah). Capacity shows how long a battery can supply current at a given load. When replacing a battery, choose the same capacity. A slightly larger one only makes sense if it fits the compartment and the charger or UPS supports it.
Dimensions and terminals. Compare length, width, height and terminal type with the old battery. Two models with the same voltage and capacity can have different terminals, and the position of the positive terminal matters because cables are often short.
Intended use. Standby batteries are built to stay charged for years and be discharged rarely, as in a UPS or an alarm panel. If the equipment often drains the battery deeply, look for models designed for cyclic use. Sealed (AGM or gel) batteries need no topping up with liquid, which makes them practical indoors.
Age and environment. Heat shortens the life of a lead-acid battery considerably, and a battery left deeply discharged for a long time is quickly damaged. Replace standby batteries according to the manufacturer's recommended interval rather than waiting for the equipment to fail.
Brands in our range
- YUASA: a Japanese-rooted manufacturer known both for motorcycle starter batteries and for sealed lead-acid batteries used for standby power.
- GREENCELL: a Polish manufacturer that focuses on replacement batteries for UPS units and other office and home equipment.
- FIAMM: an Italian manufacturer whose products cover automotive and stationary batteries.
Also in our range: QOLTEC, VOLTCRAFT, PHILIPS.
Frequently asked questions about lead-acid batteries
What is the difference between an AGM battery and a standard lead-acid battery?
In an AGM battery the electrolyte is absorbed in a glass-fibre separator, so the battery is sealed and needs no topping up. It can be used in enclosed rooms, and most models can be mounted in different positions, though not upside down. Conventional flooded batteries need maintenance and ventilation.
How long does a UPS battery last?
Standby lead-acid batteries usually last a few years, but the exact time depends on temperature, charging and the number of discharges. In a warm room they age faster. If your UPS shows a shorter runtime or a battery warning, it is time to test or replace the battery.
Can I connect several batteries together?
Yes, but only identical ones: the same voltage, capacity, manufacturer and age. A series connection raises the voltage (two 12 V batteries give 24 V), while a parallel connection raises the capacity. Do not mix different models or old and new batteries, because the weakest one quickly damages the whole set.
How do I know which battery fits my equipment?
Read the label on the old battery and note the voltage, capacity (Ah) and dimensions. The new battery should have the same voltage and the same terminal type, and the same capacity, or slightly higher if the equipment supports it. Also check that it fits the compartment.
