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Shenzhen Topband New Energy Co.,Ltd
A professional manufacturer of LiFePO4 battery / lithium iron phosphate , engaged in design , research , manufacture , sales and after sales for LiFePO4 battery( cell & pack & BMS/PCM) .
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48V 50AH Deep Cycle Lithium Battery , Rechargeable Lithium Batteries

48V 50AH Deep Cycle Lithium Battery , Rechargeable Lithium Batteries

Brand Name : Topband
Model Number : TB4850F-S110A_00
Certification : MSDS, CB, UL, UN38.3
Place of Origin : China
MOQ : 50pcs
Price : Negotiable
Payment Terms : L/C, T/T
Supply Ability : 450Mwh/year
Delivery Time : 2~4weeks for samples; 4~6weeks for mass production
Packaging Details : standard export carton
Nominal Voltage : 48V
Typical Capacity : 50Ah
Nominal Charge Voltage : 58.4V
Discharge Cut-off Voltage : 40V
Max Charge : 50A
Max Discharge : 50A
Peak Discharge : 150A
Work Temperature : -20℃ - 60℃ ( -4℉ - 140℉ )
Cycles Life : ≥2000
Weight : 25kg
Dimension : 485*170*245 mm
Material : Nano LiFePO4
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48V 50AH Deep Cycle Lithium Battery , Rechargeable Lithium Batteries

1. General Information

This specification defines the performance of rechargeable LiFePO4 battery pack TB4850F-S110A_00

manufactured by SHENZHEN TOPBAND NEW ENERGY CO.,LTD, describes the type, performance, technical characteristics, warning and caution of the battery pack.

2. Specification(@Battery initial Temp25±5℃)

2.1Rated Capacity50Ah
Minimum Capacity47.5Ah
2.3Nominal Voltage51.2V
2.4Outgoing Voltage≥51.2V
2.5Internal resistance≤80mΩ
2.6Series parallel applicationSeries connection is prohibited
2.7Limited charge voltage58.4±0.2V
2.8Floating charge voltage55.2±0.2V
2.9Standard charge current35A
2.10Maximum charge current≤50A
2.11Standard discharge current40A
2.12Maximum discharge current≤50A
2.13Pulse discharge currentWithstand the 150A/3s
2.14Discharge cut-off voltage36.8V


Dimensionlength 483.4±3mm
Width 170±3mm
Height 241±3mm
2.16WeightApprox: 24.2±0.5Kg


Operating TemperatureCharging:0~45℃
Recommended operating temperature:15℃~35℃
2.18Self-discharge rateResidual capacity:≤3%/month;≤15%/years
Reversible capacity:≤1.5%/month;≤8%/years
2.19Storage Temperature & Humidity RangeLess than 1 month:-20℃~35℃,45%RH~75%RH
Less than 3 months:-10℃~35℃,45%RH~75%RH

Recommended storage environment:


Long time storage:

If the battery need be stored for a long time, the voltage should be 26.4V(50%SOC), and stored in the condition as storage proposal. It need at least one charge & discharge cycle every six months

3. Test Conditions

3.1 Standard Test Conditions

3.1.1 Unless otherwise specified, all performance tests is required conducted at temperature 25℃±2℃, Humidity less than 45%~75%RH.

3.1.3 Unless otherwise specified, the tested product is required unused within two month after outgoing.

3.2 Standard Charge Mode

"Standard Charge" means at 25±2℃ charge to limit voltage with 0.33C constant current, then charge with constant voltage until current less than 0.02ItA.

3.3 Quick Charge Mode

" Quick Charge" means at 25±2℃ charge to limit voltage with 0.5 C constant current, then charge with constant voltage until current less than 0.02ItA.

3.4 Standard Discharge Mode

"Standard Discharge" means at 25±2℃ discharge to the cut-off voltage with 0.33C current.

3.5 Quick Discharge Mode

"Quick Discharge" means discharge to the cut-off voltage with 0.5C current.

4. Product Performance

NO.ItemsCriteriaTesting method
4.1Rated Capacity50AhRest 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 120 minutes, you can stop and define the Discharging current*time value (Ah) as battery capacity.
4.2Minimum Capacity47.5Ah
4.3Internal resistance≤80mΩ50% battery SOC state frequency of 1 KHZ ac resistance tester

Cycle life


≥2000cycleDischarge with the current of 0.33C 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.

Discharge Temperature


-20℃≥70%At 25±5℃ discharge the battery with the current of 0.33C to the cut-off voltage and record charge capacity. Store the battery at various temperatures for 2h and discharge the battery with 0.33C to the cut-off voltage.
4.6Charge Retention ability



Charge the battery to full capacity and store it for 28days, and then discharge it with 0.33C to the cut-off voltage.
Recovery capacity≥90%

5. Protective circuit specification

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.

5.1Over chargeOver-charge protection for each cell3.85±0.03V
Over-charge release for each cell3.65±0.05V
Over-charge release methodUnder the release voltage
5.2Over dischargeOver-discharge protection for each cell2.3±0.08V
Over-discharge release for each cell2.5±0.08V
Over-discharge release methodCharge to recovery
5.3Over currentDischarge over current protection170~230A
Protection delay time10~40ms
Over current release methodAfter cutoff the load
5.4Short circuitDo not short-circuit the electrodesDesigned For 230A~500A /500us
5.5Battery temperatureCharge over temperatureProtection @65±5℃
Release @50±5℃
Discharge over temperatureProtection @65±5℃
Release @50±5℃

6. Dimensional Drawing

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