Lishen LP71173207 280 Ah - 280A LiFePO4 - 3.2V akumuliatorius, B-grade
B-grade cells are cells usually did not qualify as A-grade by the manufacturer. This may be due to optical imperfections, higher self-discharge, lower capacity and/or higher internal resistance. Unfortunately manufacturers don't tell which aspects or aspects are the reason to mark a a specific cell as B-grade. We have sold several and get seldom negative feedback. We tested several eve B-grade and one had about 2% lower capacity, the other ones we did not find a difference with A-grade cells. We don't advise B-grade for high performance electric vehicles but for home energy storage they will work fine. In case you get one which performs significant less than the others like lower capacity, high self-discharge or fast wear we will replace it. Take care that we don’t put a lot of trust in a simple test of a single cell, if you buy 16 cells and you test them and they are all 6% lower than expected then your test gives to low results. If you buy and test 16 and 15 cells give you 100% and one cells gives 5% lower results then we will replace one. When we buy cells the cells are tested for voltage and internal resistance. Also a couple of every batch are tested for capacity, and if one gives less than 100% capacity we test the whole batch and discard the bad ones or don't buy the batch at all. Lot of seller in china buy B-grade cells, test them, even swap qr-codes and sell the good looking and performing as A-grade cells. We believe our B-grade cells are the same as lot of A-grade cells from China, including the well known resellers there with good reputation.
Parameters of Lishen 3.2V 272Ah LP71173207 Prismatic LiFePO4 Battery Cell
| Item | Specification |
1 | Cell Type | Lithium -ion power cell |
2 | Cell Model | LP71173207-272Ah |
3 | Nominal Capacity☆ | 272Ah(The NEW BATTERY) |
4 | Nominal Voltage☆ | 3.2V |
5 | AC-impedance(1000Hz)☆ | 0.12±0.05mΩ |
6 | Weight | 5302±100g |
7 | Maximum Charge Current at Room Temperature | 1C（Continuous） 2C (60s) |
| Charging Voltage | 3.65V |
8 | Maximum Discharge Current at Room Temperature | 1C（Continuous） 2C (60s) |
| Discharge End Voltage | 2.5V（＞0℃）、2.0V(≤0℃) |
9 | Max Operating Temperature Range | |
| Charge | 0℃ ~ 65℃ |
| Discharge | -35℃ ~ 65℃ |
10 | Optimal Operating
Temperature Range | |
| Charge | 15℃ ~ 35℃ |
| Discharge | 15℃ ~ 35℃ |
11 | Storage Temperature | |
| 1 month | -30℃~ 45℃ |
| 6 months | -20℃ ~ 35°C |
*Cells should be stored at 20%SOC-40%SOC or the voltage is between 3.275V and 3.305V. |
Remarks：The size of drawing is the cell within insulation gasket and blue film. The cell
thickness was tested at 3000N pressure
Nominal Capacity:272AhNominal
Voltage:3.2VAC-impedance
(1000Hz):0.12±0.05mΩ
Weight:5302±100g
Maximum Charge Current:1C (Continuous), 2C (60s)
Charging Voltage:3.65VMaximum
Discharge Current:1C(Continuous) , 2C (60s)
Discharge End Voltage:2.5V(＞0℃)、2.0V(≤0℃)
Remarks: Energy type advantages of LiFePO4 Prismatic Cell
1, Higher energy density.
2, Long design service life, more than 2500 times.
3, Rated voltage is 3.2V, which convenient to form a battery pack.
4, Lightweight.
5, the Working temperature is -20℃–55℃.
6, Low self-discharge (Less than 3%).
7, Save water, no need to add water.
8, No maintenance required.
9, Green solutions (non-toxic chemistries, recyclable batteries)
Caution
Charge
a) NO over-charge，the charge voltage should not be over 3.65V.
b) NO reverse charging
c) The charge temperature range is 0℃~ 65℃. The charge/discharge must be stopped when any part of the cell reach to 65℃.
d) Optimal charge temperature range is 15℃ ~ 35℃。Do not charge for a long time in the temperature less than 15℃.
Discharge
a) No short circuit
b) The end of discharge voltage must be over 2.0V.
c) The discharge temperature range is -35℃~ 65℃. The charge/discharge must be stopped when any part of the cell reach to 65℃.
d) Optimal discharge temperature range is 15 ℃~ 35℃. Do not discharge for a long time in the temperature more than 35℃
