Possible Faults With Your 12V Battery

Possible Faults With Your 12V Battery

Something wrong with your 26650 batteries, find out what kind of fault it is;

Battery problems – Manufacturing Faults

Short circuit/dead cell

Typically affecting a battery with a short (less than 12 months) service life. One cell will show a dramatically lower distinct gravity (SG) reading than the others. The affected cell will probably boil visibly under a high rate discharge test. In most cases it may also be visible as a sulphated cell.

  • The remaining skin cells will show a good SG reading of 1. 26 or over.
  • Inner surface Break
  • The battery will have good SG readings although no voltage.
  • Summary

Provided the right battery, in the suitable condition is used for the right application, the number of battery issues encountered will be minimum. All batteries have a finite time, which is governed by the conditions under which the battery performs. Battery failures caused by sulphation, wear and tear, or deep riding a bicycle are not manufacturing faults and are not covered by the manufacturer.

Power supply problems – Non-manufacturing faults


If a battery is definitely allowed to stand in a discharged state for an excessive length of time, a chemical reaction takes place, which can permanently impair effectiveness – this is sulphation. Sulphation can be seen as a fine white/grey coating on the plates. In most cases this signifies irreversible deterioration and the battery will not be serviceable. This damage can occur often in storage or if the battery is installed in a very vehicle (or equipment) that is not used for a period of time, for example a tractor, motorcycle, or boat. Even a car or truck that is located with the battery connected can still damage the battery like this. This is because there is a permanent drain on the battery from the timepiece, alarm etc . As a result the level of charge in a battery crumbles, and after a period of time sulphation will build up on the plates. The sulphation (lead sulphate) hinders the chemical reaction between the chemical p (electrolyte) and the active mass (lead compound) in the system and prevents the battery from operating as usual. This is not a manufacturing fault.

Incorrect application

The battery power recommended are those equal to or above the original equipment specification. Appropriate a smaller or less powerful battery will result in a faster service life and earlier failure, which will generally manifest itself seeing that deep cycling/premature wear and tear. This is not a manufacturing fault.


During the charge and discharge cycle, material from the battery plates (active mass) is in motion, through the electrochemical impulse that produces electricity. Every time the battery goes through the charge and discharge cycle, a small amount of the active large is lost from the plates. Because the ultimate life of an battery depends on so many factors, it is impossible to designate a minimum/maximum life expectancy. This process of normal ageing over the charge and discharge cycle will eventually cause often the battery to lose capacity, and it will come to the point where the electric battery can no longer start the vehicle/equipment. This is not a manufacturing negligence.

A battery only has a finite number of cycles (x) it can go through before it loses its capacity to do. Vehicles with high usage such as taxi’s, minicabs, trucks, in addition to buses will often subject the battery to its a number of cycles but over a much shorter time. Therefore, batteries on these vehicles can display the above indicators after 12-24 months. This is not a manufacturing fault.