Epoch Batteries 36V 50Ah Essential Series

The Epoch Batteries 36V 50Ah Essential Series is a battery pack with a nominal voltage of 38.4 V nominal, a nominal capacity of 50 Ah, 1.92 kWh of energy, dimensions of 13.0 × 6.8 × 9.44 in, a continuous discharge of 100 A and a peak of 130 A for ten seconds.

Last updated: 28 October 2026

Battery and charging

Voltage: 38.4 V nominal
Rated charge cycles: 4,000+ cycles
Nominal capacity: 50 Ah
Maximum continuous discharge: 100 A continuous, 130 A for ten seconds
Peak discharge: 130 A for ten seconds
Stated energy: 1.92 kWh
Charging voltage: 42.6–43.2 V bulk, float off or 40.0–40.8 V
Working voltage range: 30.0V – 43.8V

Battery care and safety

Ingress protection: IP65
Temperature the cells themselves charge at: The cells themselves only charge from 0 °C
Temperature it reconnects at: Reconnects at 50 °C after a high-temperature cut
Temperatures it may be charged in: Sources disagree
Temperatures it may be run in: -20°C to 60°C / -4°F to 140°F
Temperatures it may be stored in: 0°C to 35°C / 32°F to 95°F, max 12 months

Size and fit

Overall dimensions: 13.0 × 6.8 × 9.44 in
Terminals: M8 female terminals
Stated weight: 35 lb (15.9 kg)
Group the maker sells it as: Group 31 footprint — but check the measurements
Series and parallel connection: It may not be put in series at all

Identity

Model code: SKU 3650A-H

Compatible chargers

12V & 36V Onboard Marine Lithium Battery ChargerSKU CHG-2BAY-12V36VM8 ring terminalsUnconfirmedView charger: 12V & 36V Onboard Marine Lithium Battery Charger →
Epoch's own charger and Epoch's own pack. Bank two of this unit is 36 V at 10 A and Epoch state it takes a "Compatible 36V LiFePO4 battery only" — this pack is 36 V LiFePO4. It names a class and not this model, so the row establishes that the pack is inside the description bank two gives, not that Epoch tested this pairing.
12V to 36V Marine DC-to-DC ChargerSKU CHG-DC-36V36V output10AOutput ring terminalsUnconfirmedView charger: 12V to 36V Marine DC-to-DC Charger →
Epoch's own DC-to-DC charger and Epoch's own pack. The unit's output is "One compatible 36V auxiliary battery" with selectable types including 36 V LiFePO4, which this pack is. A class, not this model: Epoch name a voltage and a chemistry rather than a SKU, so the row is as specific as they were.

Devices documented to run on this

The figures below line up. Neither manufacturer states that this pack runs this device — that is our reading of what each of them published separately, not a claim by either of them or a test by us. Even where every stated figure agrees, these can still decide it:

The device’s published draw is usually a peak, not the load it holds — the two numbers are not the same kind of quantity
A maker’s amp-hour minimum and their reserve-capacity minimum can give different answers about the same battery
Conditions attached to the chemistry, such as a speed limit for running on lithium
Whether the pack may be wired in series at all, where the device needs 24 or 36 volts
The charger, which both makers put conditions on and neither supplies
Case size, hold-down and terminal type — fitting the space is not being secured in it

Worth confirming with the device's manufacturer or a dealer before buying.

One of these, on its own, at 36 V.

One of these.

Only at 36 volts, and on published figures — neither maker has named the other and nobody has tested this pairing — check yours before buying.

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 50 Ah and 100 A continuous.

Neither company has named the other, and the two figures are different kinds of number: Minn Kota's is a peak draw, Epoch's is a continuous rating.

The comparison therefore runs the cautious way round, since a pack that can supply its figure indefinitely covers a motor's worst moment; read the other way it would mean nothing.

Epoch do publish this pack in a collection titled "Lithium Batteries for Minn Kota Trolling Motors", which names the motor brand but no model.

Source: epochbatteries.com/collections/lithium-marine-batteries/lithium-batteries-for-minn-kota-trolling-motors

Garmin Force Pro (20–45 V, 50" and 57" shafts, brushless)Figures comparedView device: Garmin Force Pro (20–45 V, 50" and 57" shafts, brushless) →
Garmin Force Kraken (20–45 V, 48" to 110" shafts)Figures comparedView device: Garmin Force Kraken (20–45 V, 48" to 110" shafts) →
Garmin Force (20–45 V, 50" and 57" shafts)Figures comparedView device: Garmin Force (20–45 V, 50" and 57" shafts) →
Minn Kota Terrova 112 lb (60" shaft, CHIRP sonar, wireless remote)Figures comparedView device: Minn Kota Terrova 112 lb (60" shaft, CHIRP sonar, wireless remote) →
Only at 36 volts, where Minn Kota rate this motor at 52 A and Epoch rate this pack at 100 A continuous — check yours before buying.
Minn Kota state this 112 lb motor runs on a 36 volt system and draws up to 52 A. Epoch state this pack is 38.4 V with a maximum continuous discharge of 100 A, leaving 48 A of headroom.
Minn Kota Terrova QUEST 90/115 lb (45" shaft, CHIRP sonar, wireless remote)Figures comparedView device: Minn Kota Terrova QUEST 90/115 lb (45" shaft, CHIRP sonar, wireless remote) →
Only at 36 volts, where Minn Kota rate this motor at 58 A and Epoch rate this pack at 100 A continuous — check yours before buying.
Minn Kota state this 115 lb motor runs on a 36 volt system and draws up to 58 A. Epoch state this pack is 38.4 V with a maximum continuous discharge of 100 A, leaving 42 A of headroom.

Do not charge with

The manufacturer states these chargers must not be used with this battery:

24V 15A Lithium Battery ChargerStated incompatibleView charger: 24V 15A Lithium Battery Charger →
Epoch's page for the charger says: "This charger is intended for compatible 24V LiFePO4 batteries. Do not use it on 12V batteries, 36V batteries, 48V batteries, or lead-acid / AGM batteries unless Epoch confirms compatibility for your exact battery and application." The prohibition is conditional: Epoch leave a route open, which is to ask them about a particular battery and use. Nothing on either product's page confirms these pairings, so what is published is a refusal.
Source: epochbatteries.com/products/24v-15a-lithium-battery-charger

Sources

Epoch Batteries — Lithium Batteries for Minn Kota Trolling MotorsManufacturer battery page
Epoch Batteries
Source: epochbatteries.com/collections/lithium-marine-batteries/lithium-batteries-for-minn-kota-trolling-motors
Retrieved September 15, 2026
Epoch Batteries — 12V & 36V Onboard Marine Lithium Battery ChargerManufacturer battery page
Epoch Batteries
Source: epochbatteries.com/products/12v-36v-onboard-marine-battery-charger
Retrieved September 15, 2026
Epoch Batteries — 12V to 36V Marine DC-to-DC ChargerManufacturer battery page
Epoch Batteries
Source: epochbatteries.com/products/12v-to-36v-marine-dc-to-dc-charger
Retrieved September 15, 2026
Epoch Batteries — 24V 15A Lithium Battery ChargerManufacturer battery page
Epoch Batteries
Source: epochbatteries.com/products/24v-15a-lithium-battery-charger
Retrieved September 15, 2026
36V 50Ah Group 31 Marine Trolling Motor Battery | EpochArchived document
Source: epochbatteries.com/products/36v-50ah-lithium-trolling-motor-battery
Retrieved September 16, 2026