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BigBattery 48V 12.8kWh [TREX] | 12,800wH / 233Ah 48V LiFePO4 Lithium Battery | Connect up to 8 x Units

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SKU: FTREX-48128-G1

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Friendly Phone Support: 877-242-2792 |
Quick Quote | Mon-Fri 10am-6pm EST

Our 48V 12.8KWh battery is designed around NEW LiFePO4 cells and manufactured in the USA. We add the new BMS information Display. The product can provide you 300Amp continuous power.


This Replacement Battery Pack is an extreme upgrade to any Lead-Acid battery system in your RV, Solar, or Off-Grid Power Application. By upgrading to this BigBattery pack, you will have More Capacity, More Power, Faster Charging Capabilities, Lighter Payloads, Longer Cycle-Life and the lowest carbon footprint.

These batteries are designed to last up to (10) years with Zero Maintenance Required. In both short and long-term, we guarantee that you will see and feel the LiFePO4 difference!

The 48V TREX battery is built with a high quality BMS (battery management system) that protects the unit from any sort of accidental damage that you might cause. With a whopping 7,500W continuous discharge with a peak discharge current of 350A for 6 seconds, you can't go wrong with the 48V TREX battery. 

How do the Anderson Connectors work?

BigBattery 48V [T-REX] 12.8kWh Detailed Battery Specs:

Chemistry:           LiFePo4 (New)
Configuration:     17S 1P (Series)
Voltage:                48V
Ah Capacity:        233Ah
kWh Capacity:     12.8kWh
Wh Capacity:       12800Wh

Warranty & Guarantee:

  • Made in the USA
  • 10-Year Warranty!
  • Lifetime Customer Support (Phone, Live Chat Or Email)

Performance Specs:

Max Continuous Discharge Current:          150A
Max Continuous Power:                               7500W
Max Discharge Peak Current:                      350A (6 Seconds)
Voltage Range:                                               43 – 59.5V

Charging Specs:

Suggested Charge Voltage:     59.5V
Max Charge Current :                90A

Temperature Parameters:

Charge Temp Range (°C):                      -0°C – 55°C
Discharge Temp Range (°C):               -30°C – 55°C
Optimal Discharge Temp. Range:        15°C – 35°C
Storage Temp:                                        -20°C –  35°C (Max 6 Months)

BigBattery 48V [T-REX] 12.8kWh Dimensions:

  • Weight:    383 (LBS)
    Length:    25.5 (in)
    Width:     15 (in)
    Height:    46.5 (in)

Safety Features:

  • BMS (Battery Management System) 
  • Over Voltage, Under Voltage, Over-Current
  • (Thermal Management System), Breaker (300A)

Max Battery Connections:

  • Series:         N/A
    Parallel:      (YES)       Cap x (8)

BigBattery 48V [T-REX] 12.8kWh Features:

  •  LED Display
  •  Compact Modular Design
  •  High Temp Operating Range
  •  Best Power Density/Pack Size
  •  Best Aluminum Mosfet Design
  •  3000 A Short Circuit Protection
  •  High Cold-Cranking Amps (400A)

Warranty & Guarantee:

  • Made in the USA
  • 10-Year Warranty!
  • Lifetime Customer Support (Phone, Live Chat Or Email)

Still have questions? Don't hesitate to reach out or give us a call today at 877-242-2792


Shipping Times Estimated delivery time for in-stock orders placed today is 5-10 business days. Due to the increase in demand for off-grid solar products in 2022, our average shipping times for most orders is currently 9-12 business days.

Shipments & Lead Times: We process all orders within 72 hours. From there, we do our best to ship as quickly as possible. Shipping times vary depending on the product and size of your order. We will send you your tracking information to the e-mail and/or phone number on file.

With the incredible demand for solar products, our average delivery time to your door is between 9-12 business days from date of order. However, for some products, shipping can be as fast as 5-7 business days to your door. Please check specific product pages for the most accurate information.

*As of the start of 2022 - our stock levels are healthy and shipments are moving relatively quickly. If you place an order for something that is not in stock, or is on backorder, our team will reach out to you within 24-72 hours of placing your order to determine how you would like to move forward.

If you have any questions, give us a call at 877-242-2792 or reach out via email / live chat.

Product Description

Our 48V 12.8KWh battery is designed around NEW LiFePO4 cells and manufactured in the USA. We add the new BMS information Display. The product can provide you 300Amp continuous power.


This Replacement Battery Pack is an extreme upgrade to any Lead-Acid battery system in your RV, Solar, or Off-Grid Power Application. By upgrading to this BigBattery pack, you will have More Capacity, More Power, Faster Charging Capabilities, Lighter Payloads, Longer Cycle-Life and the lowest carbon footprint.

These batteries are designed to last up to (10) years with Zero Maintenance Required. In both short and long-term, we guarantee that you will see and feel the LiFePO4 difference!

The 48V TREX battery is built with a high quality BMS (battery management system) that protects the unit from any sort of accidental damage that you might cause. With a whopping 7,500W continuous discharge with a peak discharge current of 350A for 6 seconds, you can't go wrong with the 48V TREX battery. 

How do the Anderson Connectors work?

BigBattery 48V [T-REX] 12.8kWh Detailed Battery Specs:

Chemistry:           LiFePo4 (New)
Configuration:     17S 1P (Series)
Voltage:                48V
Ah Capacity:        233Ah
kWh Capacity:     12.8kWh
Wh Capacity:       12800Wh

Warranty & Guarantee:

  • Made in the USA
  • 10-Year Warranty!
  • Lifetime Customer Support (Phone, Live Chat Or Email)

Performance Specs:

Max Continuous Discharge Current:          150A
Max Continuous Power:                               7500W
Max Discharge Peak Current:                      350A (6 Seconds)
Voltage Range:                                               43 – 59.5V

Charging Specs:

Suggested Charge Voltage:     59.5V
Max Charge Current :                90A

Temperature Parameters:

Charge Temp Range (°C):                      -0°C – 55°C
Discharge Temp Range (°C):               -30°C – 55°C
Optimal Discharge Temp. Range:        15°C – 35°C
Storage Temp:                                        -20°C –  35°C (Max 6 Months)

BigBattery 48V [T-REX] 12.8kWh Dimensions:

  • Weight:    383 (LBS)
    Length:    25.5 (in)
    Width:     15 (in)
    Height:    46.5 (in)

Safety Features:

  • BMS (Battery Management System) 
  • Over Voltage, Under Voltage, Over-Current
  • (Thermal Management System), Breaker (300A)

Max Battery Connections:

  • Series:         N/A
    Parallel:      (YES)       Cap x (8)

BigBattery 48V [T-REX] 12.8kWh Features:

  •  LED Display
  •  Compact Modular Design
  •  High Temp Operating Range
  •  Best Power Density/Pack Size
  •  Best Aluminum Mosfet Design
  •  3000 A Short Circuit Protection
  •  High Cold-Cranking Amps (400A)

Warranty & Guarantee:

  • Made in the USA
  • 10-Year Warranty!
  • Lifetime Customer Support (Phone, Live Chat Or Email)

Still have questions? Don't hesitate to reach out or give us a call today at 877-242-2792


Shipping & Delivery

Shipping Times Estimated delivery time for in-stock orders placed today is 5-10 business days. Due to the increase in demand for off-grid solar products in 2022, our average shipping times for most orders is currently 9-12 business days.

Shipments & Lead Times: We process all orders within 72 hours. From there, we do our best to ship as quickly as possible. Shipping times vary depending on the product and size of your order. We will send you your tracking information to the e-mail and/or phone number on file.

With the incredible demand for solar products, our average delivery time to your door is between 9-12 business days from date of order. However, for some products, shipping can be as fast as 5-7 business days to your door. Please check specific product pages for the most accurate information.

*As of the start of 2022 - our stock levels are healthy and shipments are moving relatively quickly. If you place an order for something that is not in stock, or is on backorder, our team will reach out to you within 24-72 hours of placing your order to determine how you would like to move forward.

If you have any questions, give us a call at 877-242-2792 or reach out via email / live chat.

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