24V 20Ah
Deep Cycle Lithium Battery


24V 20Ah
Deep Cycle Lithium Battery

By being completely maintenance free and maintaining consistent power, the RB24V20 is perfect in many applications, including solar energy systems. This lithium iron phosphate battery and is equipped with an M8 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.



Electrical Specifications

Nominal Voltage 25.6V
Nominal Capacity 20 Ah
Capacity @ 25 A 48 min
Energy 512Wh
Resistance 50 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) 7.7 x 5.2 x 6.7” (195 x 131 x 171 mm)
Weight 11.9 lbs (5.4 kg)
Terminal Type M8 x 1.25
Terminal Torque 80 - 100 in-lbs (9 - 11 N-m)
Case Material ABS
Enclosure Protection IP66
Cell Type - Chemistry Cylindrical - LiFePO4

Discharge Specifications

Maximum Continuous Discharge Current 30 A
Peak Discharge Current 60 A (7.5 s ±2.5 s)
Discharge Over-Current Protection 170 A ±20 A (10 ±5 ms)
Recommended Low Voltage Disconnect 22.0V
Discharge Under-Voltage Protection 16.0 V (2.0 ±0.08 vpc) (20 ±6 ms)
Reconnect Voltage 20.0 V (2.5 ±0.05 vpc)
Short Circuit Protection Response Time 200-600 μs

Charge Specifications

Recommended Charge Current 1 A - 10 A
Maximum Continuous Charge Current 30 A
Charge Current 32ºF to 14ºF (0 to -10 ºC) ≤0.1 C (3 A)
Charge Current -4ºF to 14ºF (-20 to -10 ºC) ≤0.05 C (1.5 A)
Recommended Charge Voltage 28.4 V - 29.2 V
BMS Charge Voltage Cut-Off 31.2 V (3.9 ±0.025 vpc) (1 ±0.3 s)
Reconnect Voltage 30.4 V (3.8 ±0.05 vpc)
Balancing Voltage 28.8 V (3.6 ±0.025 vpc)

Temperature Specifications

Discharge Temperature -4 to 140 ºF (-20 to 60ºC)
Charge Temperature* -4 to 113 ºF (-20 to 45ºC)
Recommended Storage Temperature 23 to 95 ºF (-5 to 35ºC)
BMS High Temperature Cut-off 176 ºF (80 ºC)
Reconnect Temperature 122 ºF (50 ºC)
*Refer to charge currents below 0°C (32°F)

Compliance Specifications

Certifications UN38.3 (battery)
UKCA & CE (battery)
IEC62133-2 (battery)
UL1642 (cells) (File# MH64523)
IEC62133 (cells)
Shipping Classification UN 3480, CLASS 9


Discharge Voltage Chart 24 V graph
Charge Voltage Char Chart 24 V graph
Charge Voltage Soc Chart 24 V graph
Discharge Voltage At Various Rates 24 V graph
Cycle Life Vs Depth Discharge Chart graph
Life Vs Lead Acid Chart graph


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The RB24V20 Is Great For Powering

Charge V2 230216 114024

Backup Power

Solar 230216 114023

Renewable Energy

How to Read RELiON's Data Sheets

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Understanding the basics of battery ratings and terminology is important when comparing and selecting the right type and number of batteries for your application to ensure you have enough energy to meet your energy goals.

Learn More About LiFePO4 Battery Terms

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