Newer vehicles have different battery operation and charging modes and are equipped with many consumables that require a "stronger" AGM (Absorbent Glass Mat) or EFB (Enhanced Flooded Battery) battery. It is not desirable to fit a conventional lead-acid battery in such vehicles, and it is not enough to put it in, but the electronics need to be reset – and you cannot do this yourself.

Read the 7 things you need to know when changing your battery.

Each battery has two values highlighted in addition to the nominal voltage of 12V (if it is a car battery) – the capacity in Ah (amp-hours) and the maximum current in amperes (A). A battery with a higher Ah value can provide the same amount of current for a longer period of time or a higher amount of current in the same amount of time, measured against a battery with a lower capacity. The maximum current that the battery can deliver is a technical figure that tells you the maximum possible short-term load needed to start the engine.

When changing the battery, it is recommended to replace the EFB battery with an EFB battery. It is also possible to replace it with an AGM battery as they have similar modes of operation, but this must then be registered in the vehicle's system. The AGM battery must be replaced exclusively with an AGM to maintain the required power.

Replacing a conventional lead-acid battery with a more modern AGM or EFB battery is not recommended. Besides the fact that such models are more expensive, there is also the potential problem of compatibility of charging power and capacity. Another problem will be that AGM or EFB batteries in a vehicle designed for a conventional battery will be subjected to too frequent and excessive charging, which will quickly wear them out.

In the short term, nothing will happen if you replace an AGM or EFB battery with a conventional lead-acid battery, but it will quickly become "hungry", as older vehicles are constantly recharged, whereas more modern vehicles are not.

When connecting cables on new vehicles that have an electronic control module fitted to the minus "terminal" of the vehicle, a direct connection to the minus terminal therefore be avoided. The black cable with the vehicle's minus terminal, which "donates" the electricity, must be connected to the vehicle's chassis. Such points are already provided and clearly marked in the engine compartment and in the self-help instructions in the vehicle's owner's manual. The order of connection and disconnection must also be followed. Starting from the positive (+) terminal of the full battery (1) to the positive terminal of the empty battery (2), then the minus terminal (3) of the full battery shall be connected to the mass (4) of the vehicle with the empty battery. Then start the vehicle with a full battery (5) before starting the vehicle with an empty battery (6). The order of disconnection is reversed.

Fitting more expensive and larger batteries, if dimensionally possible, is not necessarily a better solution. Perhaps the vehicle's generator is not powerful enough to support a larger, more powerful battery, so it will fail over time due to a weaker charge.

To protect the transmission mechanism, gearbox, and timing belt distribution and drive, it is not recommended to start the vehicle by pushing it. This is due to the sudden jolt that occurs when doing so, which can damage these parts. Today, portable amplifiers are everywhere.