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14.0 – Myth about Batteries
1. Driving a car will fully recharge a battery?
2. Testing of the alternator by disconnecting the battery while the
3. Maintenance Free (MF) batteries never require maintenance?
4. A battery will not lose its charge while kept in storage.
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Some of factors affecting a car charging system's ability to charge a
battery are: how much current from the alternator is diverted to the
battery to charge it, how long the current is available and the
temperature.
Generally, idling the engine or on short stop-and-go trips during bad or
hot weather or at night will not recharge a battery. A long daytime trip in
warm weather should recharge a battery.
engine is running.
A battery acts like a voltage stabilizer or filter to the pulsating DC
produced by the charging system.
Disconnecting a battery while the engine is running can destroy sensitive
electronic components, for example, emission computer, audio system,
cell phone, alarm system, etc., or even the charging system itself.
These damages can occur because the voltage can rise to 40 volts or
more.
In the 1970s, removing a battery terminal was an accepted practice to
test charging systems of that era. That is not the case today. Just say
NO if anyone suggests this.
In hot climates, water in the electrolyte is decomposed due to the high
temperatures and normal charging of a wet maintenance free
battery. Water can also be lost due to excessive charging voltage or
charging currents.
Non-sealed batteries are recommended in hot climates so they can be
refilled with distilled water when this occurs.
Depending on the type of battery, it has natural self-discharge or internal
electrochemical leakage at a 1% to 15% rate per month that will cause it
to become sulfated and fully discharged over time.
Higher temperatures accelerate this process. A battery stored at 95° F
(35° C) will self discharge twice as fast than one at 75° F (23.9° C
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Battery Analyzer Series
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