12V 5Ah
Deep Cycle Lithium Battery


12V 5Ah
Deep Cycle Lithium Battery

Weighing only two pounds, our RB5 lithium iron phosphate battery has twice the power and lasts much longer than its lead-acid counterparts. It's ideal for industrial applications as well as recreational use where lighter weight and higher capacity are key.



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United States Of America White 230216 103954


Warranty White 230216 103954



Maintenance Free

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

Easy To Transport

Compared to other battery chemistries, RELiON LiFePO4 batteries provide the same or greater energy at less than half the weight and size. This means more flexibility and ease of use!

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 so you’re always ready to go!

Partial State of Charge Tolerant

Partial charging does not affect performance quality or battery life. A low self-discharge rate means worry-free storage so even occasional users can be assured of reliable performance.

Constant Power

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

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.


Electrical Specifications

Nominal Voltage 12.8 V
Nominal Capacity 5 Ah
Energy 64 Wh
Resistance ≤130 mΩ @ 50% SOC
Efficiency 99%
Self Discharge <3% per Month
Maximum Batteries Connected in Series 1

Mechanical Specifications

Dimensions (L x W x H) 5.9 x 2.6 x 3.9” (151 x 65 x 99 mm)
Weight 2.0 lbs (0.9 kg)
Terminal Type F2
Case Material ABS
Enclosure Protection (Waterproof Rating) IP66
Cell Type Cylindrical
Chemistry LiFePO4

Discharge Specifications

Maximum Continuous Discharge Current 5 A
Peak Discharge Current 10 A (7.5 s ±2.5 s)
BMS Discharge Current Cut-Off 15 A ±3 A (10 ±5 ms)
Recommended Low Voltage Disconnect 11.0 V
BMS Discharge Voltage Cut-Off 8.0 V (2.0 ±0.08 vpc) (100 ±50 ms)
Reconnect Voltage 10.0 V (2.5 ±0.1 vpc)
Short Circuit Protection 200-500 µs

Charge Specifications

Recommended Charge Current 0.25 A - 2.5 A
Maximum Continuous Charge Current 5 A
Charge Current 32º to 14ºF (0 to -10 ºC) ≤0.1 C (10 A)
Charge Current -4º to 14ºF (-20 to -10 ºC) ≤0.05 C (5 A)
Recommended Charge Voltage 14.2 V - 14.6 V
BMS Charge Voltage Cut-Off 15.6 V (3.9 ±0.025 vpc) (1.0 ±0.5 s)
Reconnect Voltage 15.2 V (3.8 ±0.05 vpc)

Temperature Specifications

Discharge Temperature -4 to 140 ºF (-20 to 60 ºC)
Charge Temperature* -4 to 113 ºF (-20 to 45 ºC)
Recommended Storage Temperature 23 to 95 ºF (-5 to 35 ºC)
*Refer to charge currents below 0°C (32°F)

Compliance Specifications

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

Performance Characteristics

Charge Voltage Char Chart 12 V graph
Charge Voltage Soc Chart 12 V graph
Discharge Voltage At Various Rates 12 V graph
Discharge Voltage Chart 12 V graph
Life Vs Lead Acid Chart graph
Cycle Life Vs Depth Discharge Chart graph


The RB5 Is Great For Powering

Charge V2 230216 114024

Backup Power

Anchor V2 230216 114031


Recreational 230216 114025


Understanding Battery Terms

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 Battery Terms

We're Invested In Our Lithium Iron Phosphate Batteries

Lithium Certifications Recycling 1000X300