Narada Power Source CO., LTD TT Series Battery Operation Manual
Chapter Three Operation and Maintenance
1. Operation Condition
Ambient Temperature: -40
℃～＋
55
℃
(Best temperature 20
℃～
25
℃
)
Ambient Humidity:
≤
95
％
2. Capacity
2.1.Capacity of battery
The capacity of battery is the capacity that battery can be discharged on the established
conditions, expressed as signal C. The usual unit of capacity is ampere hour, shortened as AH.
The capacity can be expressed in Rated Capacity or Actual Capacity. The Rated Capacity of
TT battery please see Table 1-1. The Actual Capacity is the product of the discharge current and
the discharge time, the unit is AH.
2.2. The Influence Factor of the Actual Capacity
The actual capacity is mainly related with the positive and negative active materials and
their utilization ratio. The utilization ratio of the materials is mainly influenced by the DOD, the
structure of the battery and manufacture technology. In using process the factors that influence
the actual capacity are discharge rate, depth of discharge, end voltage and temperature.
2.3. Discharge Rate
The discharge rate is often described as hour-rate and multiple rates.
If the discharge rate is higher and the discharge current is larger, then the discharge time is
shorter, and the capacity which can be discharged is less.
2.4. End voltage
The end voltage is the lowest working voltage below which the battery can’t be discharged
any more or it will harm the battery. Usually the 10hr rate end voltage of TT battery is 1.80V/cell.
The batteries are not able to discharge more capacity even if the end voltage is lower because of
characteristics of lead acid battery, yet the low end voltage makes great harm to the battery. It
will greatly shorten batteries’ life especially to discharge the battery to 0V while not to recharge
in time. Thus the end voltage should not be lower than what is described in table 3-1, or it will
cause over-discharge and make recharge fail after several times of over-discharge.
