3. Electrical Characteristics & Test Condition
Testing Conditions: Ambient Temperature: 25±5ºC; Huminity: 45%~75%.
UE-12Li20
03
NO.
Items
Capacity
2
3
4
-20°C
Condition
Internal Impedance
1
≤50mΩ
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.
≥20Ah
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
Automatically cutoff
discharging when
short circuit, and
release after remove
the lead.
Connect the positive and negative of this battery
pack through a lead with the resistance less than
5mΩ.
Charging with this current for more than 0.5h and the
added temperature of battery pack less than 20°C.
MAX charge Current
20A
5
Discharging with this current for more than 0.5h and
the added temperature of battery pack less than
35°C.
MAX discharge Current
20A
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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