48V 25Ah
Deep Cycle Lithium Battery
Group 24


48V 25Ah
Deep Cycle Lithium Battery
Group 24

This lithium iron phosphate battery is perfect in many solar power applications. The RB48V25 maintains consistent power and is equipped with an LINYI Connector terminal type and a built-in battery management system (BMS).



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Partial State of Charge Tolerant

Partial state of charge, known as PSOC, which is a killer of lead-acid batteries, does not affect performance or battery life of a lithium battery. Sometimes batteries don’t get fully charged, or they regularly operate in a partial state of charge. Either way, you can count on RELiON lithium batteries living a long and productive life.

Maintenance Free

Plug, play, and charge. No watering, no corrosion.

Eco-Friendly & Safe

RELiON lithium batteries are the ultimate clean energy. No gassing, no fumes, and no pollution. Enjoy reliable power, while protecting the environment, using these non-hazardous batteries.

More Usable Capacity

Lead-acid batteries are typically sized up to two times your energy needs to account for extended periods without sun and less usable energy with higher rates of discharge. Plus, you are typically cautioned to limit your use to 50% of the rated capacity, as using more can significantly reduce performance. Lithium batteries provide 100% of their rated capacity, regardless of the rate of discharge. And, you can use it all and still get substantially longer cycle life.

Highly Efficient

RELiON lithium batteries have super low resistance, allowing you to charge much faster. And lithium batteries are 99% efficient, minimizing the losses during charge. Compare that to traditional lead-acid batteries at 75-80% efficiency, which results in significant loss when recharging.

Long Life

RELiON lithium batteries provide up to 10 times longer life than lead-acid batteries, and they still provide 80% of the rated capacity after 3,500 cycles.

Fast Charging

RELiON lithium batteries charge much faster than traditional lead-acid batteries, and they’re packed with more usable energy and up to 10 times longer life so you’re always ready to go!

Constant Power

Full power available throughout discharge. Voltage does not drop like lead-acid.



Electrical Specifications

Nominal Voltage 51.2V
Nominal Capacity 25 Ah
Energy 1280 Wh
Resistence ≤70 mΩ @ 50% SOC
Efficiency 99%
Self Discharge <3% per Month
Maximum Batteries Connected in Series 1 (Single Use)

Mechanical Specifications

Dimensions (L x W x H) 10.2 x 6.7 x 8.4” (260 x 172 x 213.1 mm)
Weight 27.6 lbs (12.5 kg)
Terminal Type M8 x 1.25
Terminal Torque 80 - 100 in-lbs (9 - 11 N-m)
Case Material ABS & Polycarbonate blend (UL94-V0 flame rating)
Enclosure Protection (Waterproof Rating) IP67
Cell Type - Chemistry Cylindrical - LiFePO4

Discharge Specifications

Maximum Continuous Discharge Current 20 A
Peak Discharge Current 25 A (4 ±1 s)
Discharge Over-Current Protection 60 A ±10 A (6 ±3 ms)
Recommended Low Voltage Disconnect 44.0 V
Discharge Under-Voltage Protection 40.0 V (2.5 ±0.1 vpc) (100 ±50 ms)
Reconnect Voltage 32.0 V (2.0 ±0.1 vpc)
Short Circuit Protection 400-600 μs

Charge Specifications

Recommended Charge Current 1.25 A - 12.5 A
Maximum Charge Current 20 A
Recommended Charge Voltage 56.0 V - 58.4 V
Charge Current 32ºF to 14ºF (0 to -10 ºC) ≤0.1 C (2 A)
Charge Current -4ºF to 14ºF (-20 to -10 ºC) ≤0.05 C (1 A)
BMS Charge Voltage Cut-Off 60.8 V (3.8 ±0.05 vpc)
(1.0 ±0.5 s)
Reconnect Voltage 57.6 V (3.6 ±0.05 vpc)
Balancing Voltage 57.6 V (3.6 ±0.025 vpc)

Temperature Specifications

Discharge Temperature -4 to 140 ºF (-20 to 60 ºC)
Charge Temperature* -4 to 113 ºF (-20 to 45 ºC)
Storage Temperature 23 to 95 ºF (-5 to 35 ºC)
BMS High Temperature Cut-Off 149 ºF (65 ºC)
Reconnect Temperature 122 ºF (50 ºC)
*Refer to charge currents below 0°C (32°F)

Compliance Specifications

Certifications UN38.3, UKCA & CE (battery)
UL1642 (cells) (File# MH62098)
IEC62133 (cells)
Shipping Classification UN 3480, CLASS 9


Discharge Voltage Chart 48 V graph
Discharge Voltage At Various Rates 48 V graph
Charge Voltage Soc Chart 48 V graph
Charge Voltage Charge Chart 48 V graph
Life Vs Lead Acid Chart graph
Cycle Life Vs Depth Discharge Chart graph


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The RB48V25 Is Great For Powering

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