3. Electrical Characteristics & Test Condition
Testing Conditions: Ambient Temperature: 25±5ºC; Huminity: 45%~75%.
www.masterbattery.es
03
NO.
Items
Capacity
2
3
4
-20°C
Condition
Internal Impedance
1
≤40mΩ
Test the internal resistance of 50% SOC battery pack
with 1 kHz AC internal resistance test instrument.
Criterion
Rest for 1 hour after fully charged, then discharge
with 0.33C current until the battery reaches the
discharge cutoff voltage. Repeat above process for
three times, if the discharge time is not less than 180
minutes, you can stop and define the Discharging
current*time value (Ah) as battery capacity.
≥25Ah
Discharge
Temperature
Characteristics
At 25±5°C discharge the battery with the current of
0.33C to the cut-off voltage. Store the battery at
various temperatures for 2h and discharge the
battery with 0.33C to the cut-off voltage. Record the
ratio between discharging & charging capacity.
0°C
25°C
55°C
≥70%
≥80%
100%
≥95%
Charge the battery to full capacity and store it for 28
days, and then discharge it with 0.33C to the cut-off
voltage.
Charge Retention
ability
Remain capacity
≥90%
Short circuit protection
/
Release the charge after short circuit.
Charging with this current for more than 0.5h and the
added temperature of battery pack less than 20°C.
MAX charge Current
25A
5
Discharging with this current for more than 10 min
and the added temperature of battery pack less
than 35°C.
MAX discharge Current
25A
Discharge with the current of 0.5C until it can’t
discharge, and then rest it for 1h. Charge the battery
following CC (0.33C)/CV (14.6V) mode to full capacity,
and then rest it for 1h. Repeat above process until full
charged capacity is no more than 80% of normal
value. Accumulated times is defined as cycle life.
6
Cycle life (DOD%100)
≥2500 cycles
7
8
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C/ Dehesa Vieja,nº2 Nave 16
28052 Madrid (Spain)
Tel. (+34) 918 021 649
Fax. (+34) 917 750 542
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UE-24Li25
