The RELiON Battery RB36V40 36V 40Ah Lithium Battery is a battery pack with a nominal voltage of 38.4 V, a nominal capacity of 40 Ah, a continuous discharge of 50 A, a peak of 175 A (7.5 s ±2.5 s), a reserve capacity of 96 minutes at 25 A and a weight of 30.9 lbs (14 kg).
Last updated: 28 October 2026
Battery and charging
- Charging voltage range
- 42.6 V - 43.8 V
- Undervoltage cutoff
- 27.6 V (2.3 ±0.01 vpc)
- Voltage
- 38.4 V
- Case material
- ABS & PC blend (UL94-V0 flame rating)
- Nominal capacity
- 40 Ah
- Maximum continuous discharge
- 50 A
- Peak discharge
- 175 A (7.5 s ±2.5 s)
- Recommended charging
- 4 A – 20 A
- Series and parallel limit
- Unlimited
- Highest charge current it will take
- 40 A
- Reserve capacity
- 96 minutes at 25 A
- Recommended voltage disconnect
- 30.0 V
- BMS charge cut-off voltage
- 46.2 V (3.85 ±0.025 vpc)
- Resistance
- ≤50 mΩ @ 50% SOC
- Efficiency
- 99%
- Charging voltage
- 42.6 V - 43.8 V
- How fast it loses charge sitting idle
- <3% per Month
“Recommended Charge Voltage 42.6 V - 43.8 V”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Discharge Under-Voltage Protection” | “27.6 V (2.3 ±0.01 vpc)”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Nominal Voltage” | “38.4 V”
Source: relionbattery.com/products/lithium/rb36v40
“Case Material ABS & PC blend (UL94-V0 flame rating)”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Nominal Capacity” | “40 Ah”
Source: relionbattery.com/products/lithium/rb36v40
“Maximum Continuous Discharge Current 50 A”
Source: relionbattery.com/products/lithium/rb36v40
“Peak Discharge Current 175 A (7.5 s ±2.5 s)”
Source: relionbattery.com/products/lithium/rb36v40
“Recommended Charge Current 4 A – 20 A”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Parallel Connections” | “Unlimited”
Source: relionbattery.com/products/lithium/rb36v40
“Maximum Continuous Charge Current 40 A”
Source: relionbattery.com/products/lithium/rb36v40
“Capacity @ 25 A 96 min”
Source: relionbattery.com/products/lithium/rb36v40
“Recommended Low Voltage Disconnect 30.0 V”
Source: relionbattery.com/products/lithium/rb36v40
“BMS Charge Voltage Cut-Off 46.2 V (3.85 ±0.025 vpc)”
Source: relionbattery.com/products/lithium/rb36v40
“Resistance ≤50 mΩ @ 50% SOC”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Efficiency” | “99%”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Recommended Charge Voltage” | “42.6 V - 43.8 V”
Source: relionbattery.com/products/lithium/rb36v40
“Self Discharge <3% per Month”
Source: relionbattery.com/products/lithium/rb36v40
Battery care and safety
- Temperature at which the pack cuts power
- 167 oF (75 oC)
- What the battery management system guards against
- 200A +/- 35A (100 +/- 50ms )
- Operating temperature range
- -4 to 140 oF (-20 to 60 oC)
- Ingress protection
- IP67
- Temperature it reconnects at
- 149 oF (65 oC)
- Short-circuit cut-off
- 200-800 μs
- 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)
Row from the maker’s page: “High Temperature Cut-Off” | “167 oF (75 oC)”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Discharge Over-Current Protection” | “200A +/- 35A (100 +/- 50ms )”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Discharge Temperature” | “-4 to 140 oF (-20 to 60 oC)”
Source: relionbattery.com/products/lithium/rb36v40
“Enclosure Protection (Waterpoof Rating) IP67”
Source: relionbattery.com/products/lithium/rb36v40
“Reconnect Temperature 149 oF (65 oC)”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Short Circuit Protection Response Time” | “200-800 μs”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Charge Temperature*” | “-4 to 113 oF (-20 to 45 oC)”
Source: relionbattery.com/products/lithium/rb36v40
“Discharge Temperature -4 to 140 oF (-20 to 60 oC)”
Source: relionbattery.com/products/lithium/rb36v40
“Recommended Storage Temperature 23 to 95 oF (-5 to 35 oC)”
Source: relionbattery.com/products/lithium/rb36v40
Size and fit
- Weight
- 14 kg
- Weight
- 30.9 lbs
- Overall dimensions
- 13 x 6.8 x 8.4”329 x 172 x 214.7 mm
- Torque for the battery terminal nuts
- 80 - 100 in-lbs (9 - 11 N-m)
- Terminals
- M8 x 1.25 x 12 mm
- Stated weight
- 30.9 lbs (14 kg)
- Series and parallel connection
- Sources disagree
No series — 36 V systems only; parallel unlimited
“Series Connections No. 36V system only. Parallel Connections Unlimited”
Source: relionbattery.com/products/lithium/rb36v40
No. 36V system only.
Row from the maker’s page: “Series Connections” | “No. 36V system only.”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Weight” | “30.9 lbs (14 kg)”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Weight” | “30.9 lbs (14 kg)”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Dimensions (L x W x H)” | “13 x 6.8 x 8.4”329 x 172 x 214.7 mm”
Source: relionbattery.com/products/lithium/rb36v40
“Terminal Torque 80 - 100 in-lbs (9 - 11 N-m)”
Source: relionbattery.com/products/lithium/rb36v40
“Terminal Type M8 x 1.25 x 12 mm”
Source: relionbattery.com/products/lithium/rb36v40
Row from the maker’s page: “Weight” | “30.9 lbs (14 kg)”
Source: relionbattery.com/products/lithium/rb36v40
Product identifiers
The codes printed on the product and its packaging.
- Model code
- RB36V40
Source: relionbattery.com/products/lithium/rb36v40
“RB36V40 36V 40Ah Lithium Deep Cycle Battery Group 31”
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.
The motor's maker asks for 100 Ah minimum for a lead-acid or AGM battery, and 50 Ah to 100 Ah where the battery is lithium, and the battery must be able to supply 60 A of continuous current. This pack is rated 40 Ah and 50 A continuous.
- Garmin Force Pro (20–45 V, 50" and 57" shafts, brushless)Figures compared — they do not meetView device: Garmin Force Pro (20–45 V, 50" and 57" shafts, brushless) →
- Garmin Force Kraken (20–45 V, 48" to 110" shafts)Figures compared — they do not meetView device: Garmin Force Kraken (20–45 V, 48" to 110" shafts) →
- Garmin Force (20–45 V, 50" and 57" shafts)Figures compared — they do not meetView device: Garmin Force (20–45 V, 50" and 57" shafts) →
- Minn Kota Terrova 112 lb (60" shaft, CHIRP sonar, wireless remote)Figures compared — they do not meetView device: Minn Kota Terrova 112 lb (60" shaft, CHIRP sonar, 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: “112 lb Lithium 125–150Ah 1.5–2.5 hours Heavy-duty” 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 40 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 — RB36V40 36V 40Ah Lithium BatteryManufacturer battery page
RELiON Battery
Source: relionbattery.com/products/lithium/rb36v40
Retrieved September 15, 2026