Frequently Asked Questions

What is a battery? How does it work?

A battery is a device that stores electrical energy as chemical energy, and transforms this into electrical energy when needed.

Main duty of a battery is to supply electrical power to start up the engine initially, deliver current to receptors to be used when the vehicle engine is not working and to balance voltage and amperage within electrical system while the engine is working; thus preventing damage to receptors as the voltage amount alternator produces may be too high in rapid revolutions.  In this case, the battery takes some of the current generated by the alternator and prevents excessive voltage from increasing. 12 V battery used in petrol engines is composed of serial connected six 2V cells. Generally each element contains serial connected 5 positive and 6 negative charged plates. These plates are formed by pasting active material over lead-antimony alloy grids and applying heat.  Positive plates contain lead dioxide as active material. Negative plates contain pure lead as active material. Isolating separators are placed between the plates to prevent short circuit. Separators are made from mesoporous material that will not prevent chemical reaction between plates. Electrolyte (mixture of sulphuric acid and pure water) is poured into the battery. Elements are serial connected with lead bridges.

How to apply jump-start?

•    Ensure that the battery you use for jump-start has the same ampere value.
•    Turn off the engine and everything that consumes electricity.
•    Firstly, connect the red end of the cable to (+) terminal of discharged battery; then connect the other end to the charged battery’s terminal.
•    Afterwards, connect the black end of the cable to (-) terminal of the charged battery and the other end to any metal part of the vehicle with discharged battery.
•    Ensure that cables do not touch rotating or hot parts of the vehicle such as exhaust, rotor.
•    Start vehicle with the charged battery, then the vehicle with the discharged one.
•    After vehicles start, you can disconnect the cables starting from the vehicle with discharged battery.

What are battery types, what does “fully closed” or “dry accumulator” mean?

Batteries are categorized depending on the metal type used such as lead acid, nickel cadmium, nickel iron.

Today, most common battery type is lead-acid type which is mainly categorized as dry and flooded batteries.

Most commonly used flooded battery types are starter or the classic type SLI (starting, lighting and ignition) automobile batteries. Automobile batteries divide into two as fully sealed and the ones with ventilation caps. These two types have the same internal structure. Namely, they both are classic type, lead acid batteries. Sealed batteries differ in lacking ventilation caps. As water cannot be added to these batteries, they are more suitable for vehicles with good voltage assemblies.

Although different in terms of internal structure and areas of use, stationary and traction (forklift) batteries belong to flooded products.

Dry, namely VRLA, batteries have different internal structures and technologies. VRLA stands for Valve-Regulated Lead Acid. Similarly, these batteries are categorized according to their internal structures.

Acid spillage or leakage prevention is the main feature of AGM (Absorbent Glass Mat) and gel VRLA batteries. Gas output is minimum. Thus, they are quite safe and have significantly longer shelf lives.  Also, they are more durable against vibration compared to flooded batteries. They are easy to deliver and transport. Their areas of use include stationary plants, UPS, boats and power plants.

What does UPS battery mean?

UPS stands for “Uninterruptable Power Supply”. UPS is the type of battery used by these uninterruptable power supplies. UPS batteries activate when there is a power failure and continue to provide energy until power comes back on. These batteries are VRLA type and have minimum gas output.

What are the reasons for quick discharge of a new battery?

Potential discharge reasons of MUTLU battery you have purchased:
•    Adverse environment and storage conditions, high temperature, humidity etc.
•    Stray current in the vehicle (currents higher than estimated short circuits), lights left open
•    Short circuits on other electrical devices or equipment
•    Vehicle-battery incompatibility, selecting a small battery, extra equipment in vehicle (audio, lighting, computer systems, cooling systems)
•    Alternator’s insufficient charging

Do batteries freeze?

Yes, they do.

Freezing temperature of a fully charged battery is between -50 and -70 degrees, so a charged battery will not freeze under normal circumstances. However, discharged batteries may freeze between 0 and -10 degrees, depending on their discharge level. Batteries should be kept charged especially in cold seasons.

Are batteries harmful to environment? How much of them are recycled?

Batteries are composed of sulphuric acid solution and polypropylene case. Therefore, they pose a threat to environment when they complete their life span. However polypropylene case and lead components are 100% recyclable through and effective recycling system. Sulphuric acid is also recyclable, although it is preferably neutralized.

There is an efficient battery recycling system in our country, please give your used battery to suppliers when buying a new one.
Refer to: Waste Battery Management (

How should batteries be charged?

Refer to: Service Instructions

How do weather conditions affect batteries?

Effect of weather conditions on batteries:

1. In terms of stocking and storage:
Batteries should be stocked indoors. Dust and rainfall increase discharging rate in outdoor stocking. They should be stored in a cool and dry place as possible. Discharge rate of batteries increase or decrease in parallel with temperature. Generally, each 10-degree increase doubles the discharge rate. So, storage between 10-16 degrees are much healthier than 25-30 degrees.
2. While working on the vehicle:
During hot weathers, battery’s cranking power increases, but so does the corrosion inside the battery. Therefore, batteries used in hot climates have shorter life spans. Cold weather reduces a battery’s cranking power. In addition, vehicle engine’s starting value increases. Cranking power of batteries becomes much more important in cold weather. There is a freezing risk of the liquid (electrolyte) inside the battery in extremely cold weather. A fully charged battery freezes at -70 degrees, while a discharged one may freeze even at -5 degrees, depending on its discharge level. Therefore, it is really important that the battery is kept charged in cold weather conditions.