The RELiON Battery RB20-X 12V 20Ah Lithium Battery is a battery pack with a nominal voltage of 12.8 V, a nominal capacity of 20 Ah, 256 Wh of energy, a continuous discharge of 50 A, a peak of 90 A (4 s ±1 s) and a reserve capacity of 48 minutes at 25 A.
Last updated: 20 October 2026
Battery and charging
- Charging voltage range
- 14.2 V - 14.6 V
- Energy
- 256 Wh
- Voltage
- 12.8 V
- Case material
- ABS
- Nominal capacity
- 20 Ah
- Maximum continuous discharge
- 50 A
- Peak discharge
- 90 A (4 s ±1 s)
- Recommended charging
- 1 A - 10 A
- Highest charge current it will take
- 50 A
- Reserve capacity
- 48 minutes at 25 A
- Recommended voltage disconnect
- 11.0 V
- BMS charge cut-off voltage
- 15.6 V (3.9 ±0.025 vpc)
- Resistance
- ≤60 mΩ @ 50% SOC
- Efficiency
- 99%
- How fast it loses charge sitting idle
- <3% per Month
“Recommended Charge Voltage 14.2 V - 14.6 V”
Source: relionbattery.com/products/lithium/rb20-x
Row from the maker’s page: “Energy” | “256 Wh”
Source: relionbattery.com/products/lithium/rb20-x
Row from the maker’s page: “Nominal Voltage” | “12.8 V”
Source: relionbattery.com/products/lithium/rb20-x
Row from the maker’s page: “Case Material” | “ABS”
Source: relionbattery.com/products/lithium/rb20-x
Row from the maker’s page: “Nominal Capacity” | “20 Ah”
Source: relionbattery.com/products/lithium/rb20-x
“Maximum Continuous Discharge Current 50 A”
Source: relionbattery.com/products/lithium/rb20-x
“Peak Discharge Current 90 A (4 s ±1 s)”
Source: relionbattery.com/products/lithium/rb20-x
“Recommended Charge Current 1 A - 10 A”
Source: relionbattery.com/products/lithium/rb20-x
“Maximum Continuous Charge Current 50 A”
Source: relionbattery.com/products/lithium/rb20-x
“Capacity @ 25 A 48 min”
Source: relionbattery.com/products/lithium/rb20-x
“Recommended Low Voltage Disconnect 11.0 V”
Source: relionbattery.com/products/lithium/rb20-x
“BMS Charge Voltage Cut-Off 15.6 V (3.9 ±0.025 vpc)”
Source: relionbattery.com/products/lithium/rb20-x
“Resistance ≤60 mΩ @ 50% SOC”
Source: relionbattery.com/products/lithium/rb20-x
Row from the maker’s page: “Efficiency” | “99%”
Source: relionbattery.com/products/lithium/rb20-x
“Self Discharge <3% per Month”
Source: relionbattery.com/products/lithium/rb20-x
Battery care and safety
- Operating temperature range
- -4 to 140 ºF (-20 to 60 ºC)
- Ingress protection
- IP66
- Temperature it reconnects at
- 122 ºF (50 ºC)
- Temperatures it may be charged in
- -4 to 113 ºF (-20 to 45 ºC)
- Temperatures it may be run in
- -4 to 140 ºF (-20 to 60 ºC)
- Temperatures it may be stored in
- 23 to 95 ºF (-5 to 35 ºC)
“Discharge Temperature -4 to 140 ºF (-20 to 60 ºC)”
Source: relionbattery.com/products/lithium/rb20-x
“Enclosure Protection IP66”
Source: relionbattery.com/products/lithium/rb20-x
“Reconnect Temperature 122 ºF (50 ºC)”
Source: relionbattery.com/products/lithium/rb20-x
“Charge Temperature* -4 to 113 ºF (-20 to 45 ºC)”
Source: relionbattery.com/products/lithium/rb20-x
“Discharge Temperature -4 to 140 ºF (-20 to 60 ºC)”
Source: relionbattery.com/products/lithium/rb20-x
“Recommended Storage Temperature 23 to 95 ºF (-5 to 35 ºC)”
Source: relionbattery.com/products/lithium/rb20-x
Size and fit
- Weight
- 2.75 kg
- Weight
- 6.1 lbs
- Torque for the battery terminal nuts
- 35 - 44 in-lbs (5 - 5 N-m)
- Terminals
- M6
- Series and parallel connection
- Up to 3 in series
Row from the maker’s page: “Weight” | “6.1 lbs (2.75 kg)”
Source: relionbattery.com/products/lithium/rb20-x
Row from the maker’s page: “Weight” | “6.1 lbs (2.75 kg)”
Source: relionbattery.com/products/lithium/rb20-x
“Terminal Torque 35 - 44 in-lbs (5 - 5 N-m)”
Source: relionbattery.com/products/lithium/rb20-x
Row from the maker’s page: “Terminal Type” | “M6”
Source: relionbattery.com/products/lithium/rb20-x
“Maximum Batteries Connected in Series 3”
Source: relionbattery.com/products/lithium/rb20-x
Product identifiers
The codes printed on the product and its packaging.
- Model code
- RB20-X
Source: relionbattery.com/products/lithium/rb20-x
“RB20-X 12V 20Ah High Power Deep Cycle Lithium Battery”
Devices whose figures this pack does not meet
Neither maker names the other. These devices publish a draw this pack’s own maker does not rate it to deliver continuously. That is a comparison of two documents and not a manufacturer’s refusal — check both against your own equipment before deciding anything.
- Minn Kota Terrova 55 lb (54" shaft, wireless remote)Figures compared — they do not meetView device: Minn Kota Terrova 55 lb (54" shaft, wireless remote) →
Minn Kota ask for “at least a 105 amp-hour rating”, in a paragraph about lead-acid: “The motor will operate with any lead acid, deep cycle marine 12-volt battery/batteries. For best results, use a deep cycle, marine battery with at least a 105 amp-hour rating.” This pack is Cylindrical - LiFePO4. For a lithium pack the same maker's thrust-to-capacity table names a different figure for this motor: “55 lb AGM or Lithium 100Ah 2–4 hours Most common setup” Those are two of Minn Kota's own numbers for two different chemistries, and an amp-hour rating does not carry from one to the other, so they are set out here rather than compared. This pack is rated 20 Ah and 50 A continuous.
Source: johnsonoutdoors.widen.net/content/zp8zgjh29h/pdf/Terrova-BT-Installation-2327132rj.pdf
Source: minnkota.johnsonoutdoors.com/us/blog/selecting-best-trolling-motor-battery
Sources
- RELiON — RB20-X 12V 20Ah Lithium BatteryManufacturer battery page
RELiON Battery
Source: relionbattery.com/products/lithium/rb20-x
Retrieved September 15, 2026