Discharge curves at 5C
Discharge curves at 1C
Above you can see the test curves plotted by the Vencon analyzer.
Please disregard that temp spike in the middle, it happened because i touched the sensor.
Initial No-Load Voltage
Duration (h:m:s): 00:02:00
That is the start of the test.
One Hour Discharge
Duration (h:m:s): 00:25:13
Load current: 5,003 A
Cut-off voltage: 2,750 V
Battery discharged capacity: 2,103 Ah
Exit condition: Battery cut-off voltage reached.
The battery gave me 2.103Ah for 25 minutes continuously, note the temperature rise, it has reached around 36 Celcius.
Then there is a 10 minute rest, the temperature starts to fall now.
Then there is a pre-qualify charge which finishes in a few seconds and the main charge starts.
At 2.22C (5A) loads
Lithium-ion Charge
Duration (h:m:s): 01:46:26
Charge current: 1,575 A
Charge voltage: 4,200 V
Battery charged capacity: 2,124 Ah
Battery charged energy: 8,351 Wh
Exit condition: Final charge current reached.
This took 1 hour and 46 minutes.
After charging the 5A discharge took place one more time.
One Hour Discharge
Duration (h:m:s): 00:25:13
Load current: 5,003 A
Cut-off voltage: 2,750 V
Battery discharged capacity: 2,103 Ah
Battery discharged energy: 6,773 Wh
Battery initial-point voltage: 3,734 V
Battery mid-point voltage: 3,135 V
Battery end-point voltage: 2,752 V
Battery midpoint current: 5,003 A
Exit condition: Battery cut-off voltage reached.
Pass! Capacity=2,086 Ah (92,7% rated); Energy=6,744 Wh
Summary:
1. One Hour Discharge: Pass; Capacity=2,103 Ah (93,5% rated); Energy=6,773 Wh; IPV=3,734V; MPV=3,135V; EPV=2,752V; MPI=5,003 A.
2. Lithium-ion Charge: Capacity=2,124 Ah (94,4% rated); Energy=8,351 Wh.
3. One Hour Discharge: Pass; Capacity=2,086 Ah (92,7% rated); Energy=6,744 Wh; IPV=3,762V; MPV=3,149V; EPV=2,751V; MPI=5,003 A.
4. Li-ion 30% Charge: Capacity=675,1 mAh (30,0% rated); Energy=2,520 Wh.
At 1C (2250mA) loads
Pass! Capacity=2,103 Ah (93,4% rated); Energy=7,302 Wh
Summary:
1. One Hour Discharge: Pass; Capacity=2,186 Ah (97,2% rated); Energy=7,611 Wh; IPV=4,013V; MPV=3,264V; EPV=2,752V; MPI=2,250 A.
2. Lithium-ion Charge: Capacity=2,130 Ah (94,7% rated); Energy=8,334 Wh.
3. One Hour Discharge: Pass; Capacity=2,103 Ah (93,4% rated); Energy=7,302 Wh; IPV=4,000V; MPV=3,268V; EPV=2,753V; MPI=2,250 A.
4. Li-ion 30% Charge: Capacity=675,3 mAh (30,0% rated); Energy=2,505 Wh.
One Hour Discharge
Duration (h:m:s): 00:58:18
Load current: 2,250 A
Cut-off voltage: 2,750 V
Battery discharged capacity: 2,186 Ah
Battery discharged energy: 7,611 Wh
Battery initial-point voltage: 4,013 V
Battery mid-point voltage: 3,264 V
Battery end-point voltage: 2,752 V
Battery midpoint current: 2,250 A
Exit condition: Battery cut-off voltage reached.
Lithium-ion Charge
Duration (h:m:s): 02:05:07
Charge current: 1,575 A
Charge voltage: 4,200 V
Battery charged capacity: 2,130 Ah
Battery charged energy: 8,334 Wh
Exit condition: Final charge current reached.
One Hour Discharge
Duration (h:m:s): 00:56:04
Load current: 2,250 A
Cut-off voltage: 2,750 V
Battery discharged capacity: 2,103 Ah
Battery discharged energy: 7,302 Wh
Battery initial-point voltage: 4,000 V
Battery mid-point voltage: 3,268 V
Battery end-point voltage: 2,753 V
Battery midpoint current: 2,250 A
Exit condition: Battery cut-off voltage reached.
Li-ion 30% Charge
Duration (h:m:s): 00:32:17
Charge current: 1,575 A
Charge voltage: 4,200 V
Battery charged capacity: 675,3 mAh
Battery charged energy: 2,505 Wh
Exit condition: Maximum charge reached.
This battery has been rated around 92-93% capacity when discharged at 5Amps and 97 to 93% at 1C which seems to be great (i got 95% with a different battery at 5A). Anything above 80% seems to be OK but i prefer to get the most. After that the analyzer charges the battery up to 30% for storage mostly. Soon i'll be able to discharge at maximum rates (10A for the panasonic.) Also take a note on the temperature and how it varies depending on the current.
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