Shenzhen Topband Battery Co., Ltd
A professional manufacturer of LiFePO4 battery / lithium iron phosphate, dedicated to designing, researching, manufacturing, and exporting LiFePO4 batteries( cell & pack & energy storage system) to
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Lightweight Lithium ion Rechargeable Marine Battery 12V 250AH 2 years Warranty
1. Specification
| NO | Items | Description |
| Normal Specification | ||
| 1 | Nominal Voltage | 12.8V |
| 2 | Normal Capacity | 250Ah |
| 3 | Internal Resistance | ≤20mΩ |
| 4 | Series-Parallel application | up to 4 series-connected applications |
| 5 | Communication function | / |
| Standard Charge | ||
| 6 | Charge operation temperature range | 0~45℃ |
| 7 | Normal charge voltage | 14.6±0.1V |
| 8 | Recommended float charge voltage(for Standby use) | 13.8±0.1V |
| 9 | Allowed MAX constant charge current | 80A@Battery initial Temp 25±5℃ |
| 10 | Recommended charge current | ≤80A |
| Standard Discharge | ||
| 11 | Discharge operation temperature range | -20~60℃ |
| 12 | Output Voltage Range | 8.0~14.6V |
| 13 | Allowed MAX constant discharge current | 80A @Battery initial Temp 25±5℃ |
| 14 | Discharge peak current | 100A/30min,350A/3s |
| 15 | Discharge end voltage | 8.0V |
2. Electrical Characteristics & Test Condition
Testing Conditions: Ambient Temperature: 25±5℃; Huminity:45%~75%.
| NO | Items | Criterion | Condition | |
| 1 | Min Capacity | ≥250Ah | Rest for 1 hour after fully charged, then discharge with 0.33C current until the battery reaches the cutoff voltage. you can stop and define the Discharging current*time value (Ah) as battery capacity. | |
| 2 | | ≥2000cycle | Charge / CC(0.33C)/CV(14.6V); | |
| 3 | | -20℃ | ≥70% | At 25±5℃ 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℃ | ≥80% | |||
| 25℃ | 100% | |||
| 55℃ | ≥95% | |||
| 4 | Charge Retention ability | remain capacity≥90% | Charge the battery to full capacity and store it for 28days, and then discharge it with 0.33C to the cut-off voltage. | |
3. Circuit Protection
The batteries are supplied with a LiFePO4 Battery Management System (BMS) that can monitor and optimized each single prismatic cell during charge & discharge, to protect the battery pack overcharge, over discharge, short circuit. Overall, the BMS helps to ensure safe and accurate running.
| Test item | Content | Criterion |
| Over charge | Over-charge protection for each cell | 3.80±0.03V |
| Over-charge release for each cell | 3.60±0.05V | |
| Over-charge release method | Under the release voltage | |
| Over discharge | Over-discharge protection for each cell | 2.00±0.05V |
| Over-discharge release for each cell | 2.30±0.05V | |
| Over-discharge release method | Charging | |
| Over current | Discharge over current protection | 350~550A |
| Protection delay time | 10~40ms | |
| Over current release method | Release after cutoff the load. | |
Over | Battery over temperature | Protection @65±5℃ |
| Release @50±5℃ | ||
Over | Battery lower temperature | Protection @100±5℃ |
| Release @70±15℃ |
4. Dimensional Drawing