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RELiON RB75 12V 75Ah Lithium Deep-Cycle RV Battery - Campervan HQ

RELiON RB75 12V 75Ah Lithium Deep-Cycle RV Battery

  • $ 997.56
  • Save $ 202

Finally, affordable and reliable lithium batteries for your RV! What are the advantages of using lithium batteries like the RELiON RB75 12V 75Ah Lithium Deep-Cycle RV Battery in your RV? Lithium battery advantages include:

  • Much faster charging times, charging to 99% in 2.5 hours versus up 13 hours for lead acid batteries.
  • Can accept very high charge rates (75A)
  • Longer life - much greater number of cycles
  • Less than half the weight of similar-capacity lead-acid batteries
  • No maintenance required
  • No battery memory
  • No internal grid or external terminal corrosion
  • No freezing in extreme temperatures
  • Almost no temperature derating effects (still 90Ah capacity at 5C for 100Ah lithium, compared to 60Ah capacity at 5C for 100Ah lead-acid)
  • Ability to mount in any orientation
  • 95% energy efficient
  • Can store at any state-of-charge (SOC) - does not have to be fully-charged for storage, unlike lead-acid

Though the purchase cost is higher for lithium batteries than for AGM or flooded lead-acid, the overall lifecycle cost is actually lower for lithium batteries.  The lithium batteries have an average life span of 10 times that of lead acid.

Relion Lithium Battery vs Lead-Acid Battery Comparison

Lithium iron phosphate batteries have excellent characteristics for use as a deep-cycle RV battery:

  • Lithium iron phosphate has a slightly lower specific energy (in RELiON batteries, about 130 Wh/kg), but has high current rating and long cycle life, good thermal stability, enhanced safety and tolerance for abuse. 
  • Lithium iron phosphate batteries also have a very flat discharge curve, meaning the batteries continue to put out the same amount of energy even at a low state-of-charge.

Why are RELiON lithium iron phosphate batteries better than other lithium batteries?

  • Cylindrical cells - RELiON batteries use 32650 stainless-steel cylindrical lithium-ion battery cells. Cylindrical lithium cells typically have much more power, better performance and greater longevity than prismatic cells. 
  • Triple safety design - In contrast to typical lithium battery design, RELiON lithium batteries have 3 layers of safety protection in each cell:
    • The stainless-steel lithium iron phosphate cells include an internal safety fuse. In the unlikely event that the cell was to overheat (up to 135C), the fuse would instantly break the connection between the anode and the cathode. 
    • Lengthways circuit boards between each layer of cells monitor current, temperature and pressure. If the cell casing shows high internal pressure, the positive and external (negative) current will be cut off by the automatic voltage cutoff. These boards also prevent a short-circuited cell from causing any battery damage.
    • If the internal pressure in any cell is over the safe value of 1.5Mpa, its safety valve discharges, reducing the pressure automatically.
  • Solid construction - Relion batteries use stainless-steel explosion-proof cells, and each cell has its top and bottom negative and positive posts welded to a plate, and then bolted to the plate as well for a secure physical and electrical connection. The very solid assembly enabled RELiON lithium batteries to pass the stringent GB/T 2423.10-2008 shock/vibration testing.
  • Full-featured Battery Management System (BMS) - The "brains" of the battery is the Power Control Board (PCB), which provides the BMS features. Heat-shielded battery cables connect the lengthways circuit boards to the PCB. The BMS features include automatic low- and over-voltage protection, short-circuit protection, reverse polarity protection, and charge balancing. Because of the BMS, you can connect multiple RELiON lithium batteries in series or parallel without external protection.
  • Industry-leading warranty - The comprehensive Relion lithium battery warranty is a 5-year limited warranty: first three years full replacement, last 2 years pro-rated. No other lithium battery manufacturer stands behind their lithium batteries like Relion.

Free shipping on batteries to commercial addresses within 60 miles of any of our western US warehouse locations. Shipping outside of warehouse areas will differ depending on location and weight - batteries are heavy and bulky items.


 Specifications: RELiON RB75 12V 75Ah Lithium Deep-Cycle RV Battery

Length (in.) 10.25
Width (in.) 6.6
Height (in.) 8.6
Weight (lbs.) 26 
Voltage 12.8 VDC nominal
Capacity 75 AH @ 20 hour rate
Max Charge Rate 75A
Operating Temperature -4 + 158 F / -20 + 70 C
Life Expectancy 3000-5000 Cycles
Auto Low/High Voltage Cutoff 8V / 16V


Documents: RELiON RB75 12V 75Ah Lithium Deep-Cycle RV Battery

RELiON RB75 Lithium Battery Specifications 


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