AMER-EN-TM-ODY July 2021
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realistic. Because the discharge is for such a short time, it is more like a pulse. The low impedance
of ODYSSEY battery technology allows them to maintain a higher voltage for more starter pulses,
resulting in less heating of starter motors and cables. Higher power output results in a faster start.
What is impedance?
The impedance of a battery is a measure of its internal resistance. The lower the battery impedance
the more the available power. The impedance of ODYSSEY
®
AGM
2
batteries is considerably
lower than that of a conventional automotive or marine battery. The high rate discharge capability
of ODYSSEY AGM
2
automotive and marine batteries is significantly higher than that of conventional
automotive and marine batteries.
What is Reserve Capacity (RC) rating?
The RC of a battery is the number of minutes it can support a 25-ampere load at 80°F (27°C) before
its voltage drops to 10.50V for a 12V battery. A 12V battery with a reserve capacity rating of 100 will
deliver 25 amps for 100 minutes at 80°F (27°C) before its voltage drops to 10.5V.
What is the short-circuit current of these batteries?
Typically thousands of amps. As mentioned before, the AGM
2
batteries have a very low internal
resistance, which means that the short circuit current is very high. Precautions should be taken to
avoid short circuits as equipment and battery damage will occur.
What is the operating temperature range of these batteries?
The operating range varies based on the battery type. Refer to table 3 on page 7 for details.
Is the battery ruined if it is dropped?
It is possible to damage the internal connections as well as the external container, leading to a
damaged the battery. Batteries with visible external damage should not be used. Dropped batteries
should be tested prior to use.
VIII. DEFINITIONS OF ACRONYMS
AGM
– Absorbed Glass Matt battery. This is a type of VRLA battery in which all the electrolyte in the
battery is absorbed into the glass mat separator material.
TPPL – Thin Plate Pure Lead.
This refers to the fact that these batteries are made of very thin plates,
which do not contain any calcium or other typical impurities which deplete battery voltage over time.
VRLA Battery – Valve Regulated Lead Acid Battery.
These lead acid batteries are designed to include
pressure relief valves that allow for nearly 100% recombination of the gasses that would vent in
traditional flooded batteries. Because of this very efficient recombination process, there is no need
to periodically add water to these batteries.
OCV – Open Circuit Voltage.
This is a voltage reading obtained from a battery that is not charging or
discharging. To get an accurate OCV on AGM
2
batteries, it is important to wait at least four hours after
charging or 30 minutes after discharging to take the voltage reading.
DOD – Depth of Discharge.
This is the measure of how many amp hours were taken out of a battery
compared to the battery’s rating. For example, a 100 amp-hour battery which has 40 amp-hours
removed during discharge is said to be at 40% DOD.
SOC – State of Charge.
The level of charge of a battery. It can be approximated by evaluating the
battery’s OCV.
15
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