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PRICE: $656.95

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The RB50 is a 12V 50Ah lithium marine deep cycle battery. The RB50 offers abundant power in a small footprint. It’s versatile and compact enough to be used in many marine applications including smaller boats with lower battery requirements, boats that require two of the same batteries and boats with electrical systems designed for just one battery.

The RB50 is a lithium iron phosphate (LiFePO4) battery with more power, less weight and up to 10x longer life than its lead-acid counterparts. Lithium is the logical choice for marine applications where you need a longer run time and reliability. RELiON lithium batteries provide more energy for high consumption than traditional lead-acid batteries. Lead-acid batteries also need to be maintained. If they are not maintained properly, their life span is shortened. Because lithium batteries require no active maintenance, a one-time purchase guarantees better lifetime value.

PRODUCT SPECIFICATIONS
  • Voltage: 12.8V
  • Amp Hours: 50Ah
DIMENSIONS & WEIGHT
  • Length: 7.8 in (197 mm)
  • Width: 6.5 in (166 mm)
  • Height: 6.8 in (173 mm)
  • Weight: 14.8 lbs (6.7 kg)
APPLICATIONS
  • AWP
  • Floor Machines
  • Marine
  • Recreational Vehicles
  • Solar

Frequently Asked Questions

Can I use my existing lead-acid battery charger (Wet, AGM or Gel) to charge RELiON lithium iron phosphate batteries?
Most likely, yes. Our lithium batteries are very charger-friendly. Most chargers today have a lithium charge profile, which is what we recommend using. AGM or gel charge profile chargers will work with our batteries. We do not recommend the use of a flooded charge profile with our 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 our Lithium
Can I use my alternator to charge my lithium iron phosphate batteries?
RELiON batteries can be charged with most alternators. Depending on the quality of the alternator, it should work with LiFePO4 batteries. Low quality alternators with poor voltage regulation can cause the BMS to disconnect LiFePO4 batteries. If the BMS disconnects the batteries, the alternator could be damaged. To protect your LiFePO4 battery and alternator please be sure to use a compatible high-quality alternator or install a voltage regulator.
Why are lithium marine batteries better than lead-acid alternatives?
Heavy lead-acid batteries drag your boating speed and performance down. When you have a small boat, a heavy battery also reduces your fuel consumption efficiency. Instead, you need a lightweight marine battery that’s optimized for high performance. Rechargeable deep cycle lithium iron phosphate (LiFePO4) batteries are one-third the weight of lead-acid alternatives. In addition to providing benefits such as higher capacity and more runtime between charging, lithium batteries offer many advantages out on the water due to their lighter weight.

Pro Angler Patrick Walters Talks About His LiFePO4 Batteries

DATA SHEET

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Chemical Specifications

Nominal Voltage 12.8 V
Nominal Capacity 50 Ah
Capacity @ 25A 120 min
Energy 640 Wh
Resistance ≤50 mΩ @ 50% SOC
Efficiency 99%
Self Discharge <3% per Month
Maximum Modules in Series 4

Mechanical Specifications

Dimensions (L x W x H) 7.8 x 6.5 x 6.8” 197 x 166 x 173 mm
Weight 15 lbs (6.7 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

Discharge Specifications

Maximum Continuous Discharge Current 50 A
Peak Discharge Current 100 A (7.5 s ±2.5 s)
BMS Discharge Current Cut-Off 170 A ±20 A (10 ±5 ms)
Recommended Low Voltage Disconnect 11 V
BMS Discharge Voltage Cut-Off 8 V (2.0 ±0.08 vpc) (140 ±60 ms)
Reconnect Voltage 9.2 V (2.3 ±0.1 vpc)
Short Circuit Protection 200-600 µs

Charge Specifications

Recommended Charge Current 2.5 A - 25 A
Maximum Charge Current 50 A
Charge Current 32º to 14ºF (0 to -10 ºC) ≤0.1 C
Charge Current -4º to 14ºF (-20 to -10 ºC) ≤0.05 C
Recommended Charge Voltage 14.2 V - 14.6 V
BMS Charge Voltage Cut-Off 15.6 V (3.9 ±0.025 vpc)
(1.1 ±0.4 s)
Reconnect Voltage 15.2 V (3.8 ±0.05 vpc)
Balancing Voltage 14.4 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 176 ºF (80 ºC)
Reconnect Temperature 122 ºF (50 ºC)
*Refer to charge currents below 0°C (32°F)

Compliance Specifications

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

PERFORMANCE CHARACTERISTICS

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