User Manual

745-680-B2-002, Rev. B
10
1.5 Temperature and Battery Life
High temperatures can harm the battery and reduce its lifespan. Battery life decreases by
50% every 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)
Type InternalResistance(mΩ) Short Circuit Current (A)
SMU-HR 12-9 32.4 370
SMU-HR 12-18 15.0 800
SMU-HR 12-35 10.0 1239
SMU-HR 12-55 8.50 1498
SMU-HR 12-75 6.50 1959
SMU-HR 12-90 5.20 2442
SMU-HR 12-100 5.22 2247
SMU-HR 12-150 4.14 3072
CAUTION!
A short circuit current will decrease the voltage of the battery to 0V, and damage the internal
components.
1.0 Introduction, continued