Instruction Manual

11
745-680-B11-001, Rev. A
1.5 Temperature and Battery Life
High temperatures can harm the battery and reduce its lifespan. Battery life decreases by
50% per 15ºF (~ 9ºC) above the standard operating temperature of 77ºF (25ºC).
To minimize battery damage:
Use temperature compensated chargers.•
Never allow the battery's temperature to exceed +131ºF (+55°C).•
Make sure operating area is properly ventilated, so heat cannot accumulate.•
Provide at least 0.39" (10mm) of space between batteries to enhance convective cooling.•
Visit sites annually to check for shorted cells, improperly set voltages, lter cleaning on •
ventilation systems, etc.
1.6 Internal Resistance and Short-circuit Current
The internal resistance of the battery is affected by temperature and charge state. The
internal resistance is lowest when the battery is fully charged.
Table 1-2, Internal Resistance and Short Circuit Current at 77ºF (25ºC)
1.0 Introduction, continued
Type
Internal
Resistance
(mΩ)
Short Circuit
Current (A)
SMU-C6-4.5 22 273
SMU-C6-7 14 429
SMU-C6-12 10 600
SMU-C 12-4.5 35 343
SMU-C 12-7 20 600
SMU-C 12-12 16 750
SMU-C 12-14 16 750
SMU-C 12-18 14 857
SMU-C 12-26 12 1000
SMU-C 12-28 12 1000
SMU-C 12-30 12 1000
SMU-C 12-35 10 1200
SMU-C 12-40 9.5 1263
SMU-C 12-55 6.0 2000
SMU-C 12-65 6.0 2000
SMU-C 12-75 5.5 2182
SMU-C 12-90 5.2 2308
SMU-C 12-100 5.0 2400
SMU-C 12-120 4.5 2667
SMU-C 12-134 4.0 3000
SMU-C 12-150 4.0 3000
SMU-C 12-200 3.8 3158
A short circuit current will decrease the voltage of the battery to 0V, and damage the internal
components.
CAUTION!