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SBS-6500 User Manual
Storage Battery Systems, LLC.
3.5.
Judgment of Battery Condition
Battery condition is judged based on measurement data of battery impedance (internal
resistance) and voltage when compared to a reference value for that particular make and
model of battery when it was new. Each battery manufacturer should provide guidance for
reference values to be used for determining replacement criteria.
□
Battery reference value. Example: 4mΩ, 1.6V.
□
Standard to judge battery condition.
Impedance:
[WARNING] 5.2mΩ (1.3 times increased from Initial data: 4mΩ ).
(130% of initial)
[FAIL] 6mΩ (1.5 times increased from Initial data: 4mΩ ).
(150% of initial)
Voltage :
[WARNING] Minimum acceptable float voltage or open circuit voltage for the
battery / cell –or- (1.44V (90% of initial data: 1.6V) for non-rechargeable cells.
Battery deterioration can be judged from impedance. Impedance value usually
increased by 1.3 to 1.5 times from initial data from a new or good battery. There are
differences from each manufacture even for batteries of the same capacity.
Measurement voltage decreases from initial data from new or good battery due to
plate deterioration or sulfation of the plates.
Impedance and voltage data trends can be used as a reference to judge battery
condition and plan replacements in advance prior to system failures.
[Standard to judge on battery deterioration]
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
