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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48V 50Ah 3U Telecom Batteries, back up lithium ion battery
1. Specifications:
| NO | Items | Characteristics | |
| 1.1 | Normal capacity | 50Ah | |
| 1.2 | Nominal energy | 2.4kWh | |
| 1.3 | Nominal voltage | 48V (LFP-15S) | |
| 1.4 | Internal resistance | ≤50mΩ @1kHz AC | |
| 1.5 | Normal charge voltage | 57.00±0.3V | |
| 1.6 | Float charge voltage(for Standby use) | 51.75±0.3V | |
| 1.7 | Allowed MAX charge current | 25A | |
| 1.8 | Recommended charge current | 25A | |
| 1.11 | Allowed MAX discharge current | 50A | |
| 1.12 | End of discharge voltage | 37.5V | |
| 1.13 | Dimension | Width 482.6±5 mm(internal 442±5mm) | |
| Height 133.2±3 mm | |||
| Depth 477±5 mm | |||
| 1.14 | Weight (No accessories) | Approx. 28.0Kg | |
| 1.15 | Operation temperature | Charge | 0～45℃ |
| Discharge | -20～60℃ | ||
| 1.16 | Self-discharge rate | Residual capacity | ≤3%/Month; ≤15%/ year |
| Recover capacity | ≤1.5%/Month; ≤8%/ year | ||
| 1.17 | Storage environment | ≤1month | -20～+60℃,5～75%RH |
| ≥3month | -10～+45℃,5～75%RH | ||
| Recommend environment | 15～35℃,5～75%RH | ||
2. Electrical Characteristics & Test Condition
Testing Conditions: Ambient Temperature: 25±5℃; Humidity:45%~75%.
Normal charge:Charge battery under CC(0.33C)/CV(54.8V) mode until over charge protection or the charge current reduce to 0.02C, and then rest for 1h.
| NO | Items | Criterion | Condition | |||
| 2.1 | Normal Capacity | 50Ah | After Normal charge, discharge @0.5C current to the end of discharge voltage. | |||
| 2.2 | Internal Impedance | ≤50mΩ | @50% SOC @1kHz AC internal resistance test instrument. | |||
| 2.3 | Short circuit protection | Auto cutoff load when short circuit | Connect the positive and negative of this battery pack through a lead with 0.1Ω resistance. | |||
| 2.4 | Cycle life @DOD100% | ≥2000 cycles | After Normal charge,discharge @0.33C current to the end of discharge voltage. Repeat above process until discharge capacity reduce to 80% of initial value. | |||
| 2.5 | Discharge temperature characteristic@0.2C | -20℃(6h) | ≥60% |
Capacity @specified temperature Capacity @ 25℃
| ||
| 0℃(6h) | ≥80% | |||||
| 25℃(4h) | ≥100% | |||||
| 55℃(4h) | ≥95% | |||||
| 2.6 | Capacity retention rate | remain capacity ≥96% | After normal charge, store the battery @25±5℃ for 28days, then discharge capacity @0.2C,the retention capacity accord with criterion. | |||
3. Operation instruction
Special note:
A short time of overcharging and over-discharging will not affect the use of the battery, but a long time of over-discharging or overcharging will affect the functional failure of the battery, or the battery is permanently unable to use, serious safety risks, need for a long time floating charge, please use the specification recommended floating charging mode. When the battery is not used for a long time, the self-discharge characteristics of the battery will also lead to over-discharge. In order to prevent the occurrence of over-discharge, the battery should maintain a certain amount of electricity and maintain its voltage at 50% SOC state.
1. Pack in safety industrial package, with IATA shipping standard.
2. For sample or small order: ship by DHL, UPS, FedEx and TNT etc…
3. For large order, ship by AIR or OCEAN.