300Ah 12V Lithium Battery Group 8D RB300-HP

Regular Price
Sale Price
Regular Price

Sold Out
Unit Price
translation missing: en.general.accessibility.unit_price_separator 


Purchase 2 or more Relion Batteries and Get a FREE Victron SmartShunt

Add batteries and 500A SmartShunt to your cart and use Code: FREESMARTSHUNT


The RELiON 12V 300Ah dual purpose lithium battery is the perfect replacement for a group 8D sized battery. Weighing in at only 83 lbs it’s a relatively lightweight alternative to lead-acid and one of the most popular lithium batteries. The HP Series batteries are high performing dual purpose deep cycle batteries that can handle both starting and cycling. The RB300-HP has increased peak amps over the standard batteries. This increase in peak amps can be used to start motors, electric start generators and other high amp draw devices. After starting, the battery can double as a house battery providing power for peripherals, accessories and other onboard needs.

The RB300-HP surpasses expectation by being versatile, compact and more powerful than its lead-acid counterparts. It’s the perfect combination of size and capacity to fit many applications including, RV, marine, solar energy systems and more.

RELiON lithium iron phosphate (LiFePO4) batteries provide more energy for high consumption than traditional lead-acid batteries. They also offer fast charging and discharging, high efficiency and a longer cycle life – plus no maintenance!

Not all lithium batteries are created equal. All RELiON Batteries use the safest and most stable components, including a LiFePO4 cathode and a built-in Battery Management System (BMS). The BMS ensures a long lifetime, safe handling – and high-accuracy State of Charge (SOC) calculations.



  • 300 Ah
  • 3840 Wh
  • 12.8 V
  • Group 8D size
  • LiFePO4 battery chemistry
  • Built-in battery management system (BMS)

Wee Expert Tip - Use a Victron SmartShunt battery monitor to conveniently read out battery parameters, like state of charge, time to go, historical information and much more via a Bluetooth connection to the VictronConnect App on your phone (or tablet).



Can I use my existing lead-acid battery charger (Wet, AGM or Gel) to charge RELiON lithium iron phosphate batteries?
  • Most likely, yes. RELiON lithium batteries are very charger-friendly. Most chargers today have a lithium charge profile, which is what RELiON recommends using. AGM or gel charge profile chargers will work with RELiON batteries. RELiON does not recommend the use of a flooded charge profile with their batteries. These chargers may reach the overvoltage protection limit and disconnect. It won’t damage the battery but will likely result in charger faults. See RELiON's Lithium Charging Instructions for more details.





       Download Data Sheet



      Nominal Voltage 12.8 V
      Nominal Capacity 300 Ah
      Capacity @ 25A 720 min
      Energy 3840 Wh
      Resistance ≤30 mΩ @ 50% SOC
      Efficiency 99%
      Self Discharge <3% per Month
      Maximum Modules in Series 1 (Single Use)


      Dimensions (L x W x H) 20.5 x 10.5 x 9.0” 520 x 267 x 228 mm
      Weight 83 lbs (37.5 kg)
      Terminal Type M8
      Terminal Torque 80 - 100 in-lbs (9 - 11 N-m)
      Case Material ABS
      Enclosure Protection IP56
      Cell Type - Chemistry Cylindrical - LiFePO4


      Maximum Continuous Discharge Current 100 A
      Peak Discharge Current 800 A (2 s)
      BMS Discharge Current Cut-Off 1000 A ±100 A (2.2 ±1 ms)
      Recommended Low Voltage Disconnect 11 V
      BMS Discharge Voltage Cut-Off 9.2 V (2.3 ±0.08 vpc) (4.2 ±0.5 s)
      Reconnect Voltage 10 V (2.5 ±0.1 vpc)
      Short Circuit Protection 200-600 µs


      Recommended Charge Current 15 A - 50 A
      Maximum Charge Current 100 A
      Charge Current (0 to -10 ºC) ≤0.1 C
      Charge Current (-20 to -10 ºC) ≤0.05 C
      Recommended Charge Voltage 14.2 V - 14.6 V
      BMS Charge Voltage Cut-Off 15.4 V (3.85 ±0.025 vpc)
      (1 ±0.2 s)
      Reconnect Voltage 14.6 V (3.65 ±0.05 vpc)
      Balancing Voltage 14.4 V (3.6 ±0.025 vpc)


      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 176 ºF (80 ºC)
      Reconnect Temperature 122 ºF (50 ºC)


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


        Best Use Replacement for a Group 8D sized dual-purpose battery
        Battery Weight 83 lbs
        Warranty 10 year manufacturer's warranty period (first 36 months are free replacement or repair coverage)





        Have a Question?

        Be the first to ask a question about this.

        Ask a Question