National Batteries Company
Battery Management

Battery Management

When two dissimilar conducting materials (electrodes) are immersed in a solution capable of conducting electricity (an electrolyte) one will become positively charged and the other negatively. The ends of the electrodes protruding above the electrolyte are known as the positive and negative terminals and the whole unit is called a cell. Connecting the terminals with a wire will cause an electrical current to flow through the wire from the positive to the negative terminal.

The potential difference or electrical pressure between the terminals is dependent upon the materials of the electrodes and the electyrolyte and is measured in volts.

Purpose of the Battery
The three main functions of the automotive battery are to:
  • Supply power to the starter and ignition system so that the engine can be cranked and started.
  • Supplement the charger system when load requirements exceed the supply capability of the alternator.
  • Act as a voltage stabilizer in the electrical system. The battery smoothes out or reduces temporarily high voltages (transients) which may occur in the system, thereby protecting voltage sensitive components.
Battery Ratings- The following are the batteries ratings and different tests according to the standards

Rated Capacity - Capacity of a Battery is denoted by Ampere Hour at a given rate of discharge up to a given end cutoff voltage at a given temperature. As per JIS (D5301) batteries are rated at 5 Hrs rate of discharge up to 10.5 volts at 25° C.

Reserve Capacity Rating - Capacity expressed as the number of minutes which a new fully charged battery at 25°C can be continuously discharged at 25 amperes and maintain a terminal voltage equal to or higher than 10.5 volts per cell. RC = ((C20+133.3)2-17778) / 208.3

Cold Cranking Amperes (CCA)- Cold Cranking Performance rating is the discharge load in amperes which a new fully charged battery at -18°C can deliver. This is to ensure that the battery can deliver the required Cranking Amps in the cold climate.

Cranking Amperes (CA) - Cranking Performance rating is the discharge load in amperes which a new fully charged battery at 0°C can deliver. This is to ensure that the battery can deliver the required Cranking Amps in Hot climate.

C20-HOUR CAPACITY The 20-hour capacity is the current in amperes which a 12 volt battery can supply for a period of 20 Hours while maintaining a voltage at greater than 10.5 volts @ 25° C

C5-HOUR CAPACITY The 5-hour rate capacity is the current in amperes which a 12 volt battery can supply for a period of 5 Hours, while maintaining a voltage at greater than 10.5 volts @ 25° C

The difference between Conventional Batteries, Hybrid Batteries and MF Batteries

DescriptionConventional Batteries- Dry chargedHybrid Batteries-Dry chargedMF Batteries
Plate Lead Alloy Positive and negative plates of Lead antimony alloy Positive plates of Lead antimony and negative of Lead calcium alloy Positive and negative plates of Lead Calcium Alloy
Activation To be activated with electrolyte. Ideally 20 mins rest to be provided for propoer activation after electrolyte filling. Electrolyte of correct sp. gr and quality to be filled. To be activated with electrolyte. Ideally 20 mins rest to be provided for propoer activation after electrolyte filling. Electrolyte of correct sp. gr and quality to be filled. No need of Activation since supplied in filled and charged condition from the Factory.
Storage Up to two years before activation with electrolyte. However the battery to be stored in cool and dry place.Not effected by Self Discharge when stored in dry condition. Up to two years before activation with electrolyte. However the battery to be stored in cool and dry place.Not effected by Self Discharge when stored in dry condition. 3-4 Months at an Average ambient Temp of 35 Deg C. Refer to the Technical write up for details of self discharge.
Electrolyte accessibility and electrolyte Topup (Adding Distilled Water) Accessible electrolyte, Top up frequency once 2-3 Months. This may varry depending on Alternator condition, driving pattern and ambient temp. Accessible electrolyte, Top up frequency once 4-6 Months. This may varry depending on Alternator condition, driving pattern and ambient temp. Electrolyte not accessible.Doesn't require top up in its entire service period.
Deep discharge endurance (when the battery is abused) Very Good Very Good Good
Resistance to overcharging (when the battery is abused) Very Good Very Good Good
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