Lithium Rhino vs EPOCH 36V Trolling Batteries

August 8, 2026 · Marine Battery Source

If you run a 36V trolling motor, a single-case 36V lithium battery is one of the best upgrades you can make. It replaces three heavy 12V batteries, removes series jumpers and holds voltage all day. In our store, Lithium Rhino and EPOCH both offer single-case 36V batteries in two sizes each. This comparison uses our product listings to help you choose. Check product pages for current specs and stock.

The short version

Choose Lithium Rhino for more amp-hours per size class, an IP67 case across the line and listed 150A continuous output.
Choose EPOCH for internal heating, Bluetooth, an 11-year listed warranty and a compact 36V 50Ah that fits a group 31-size space.

The four batteries

	Lithium Rhino 36V 65Ah	Lithium Rhino 36V 120Ah	EPOCH 36V 50Ah Essential	EPOCH 36V 100Ah
Capacity	65Ah	120Ah	50Ah	100Ah
Energy (approx.)	2.5 kWh	4.6 kWh	1.9 kWh	3.8 kWh
Ingress protection	IP67	IP67	IP65	IP67
Bluetooth	Yes	Yes	Yes	Yes
Internal heating	Not listed	Not listed	Yes	Yes
Continuous discharge	150A	150A	Check listing	Check listing
Max charge current	50A	50A	Check listing	Check listing
Weight	Check listing	Check listing	35 lb	75 lb
Listed warranty	8 years	8 years	11 years	11 years
Listed cycle life	6,000+	6,000+	Check listing	Check listing

Energy is capacity times a 38.4V nominal LiFePO4 voltage, rounded.

Key takeaways: Lithium Rhino vs EPOCH 36V Trolling Batteries

Capacity: how much do you need?

Your trolling motor’s average draw decides it. A 36V motor might average 15–25A over a day of mixed use, more with heavy GPS anchoring in wind.

Average draw	6 hours uses	Good fit
10A	60Ah	EPOCH 50Ah (careful), Rhino 65Ah
15A	90Ah	EPOCH 100Ah, Rhino 120Ah
20A	120Ah	Rhino 120Ah
25A	150Ah	Rhino 120Ah plus charging on the run

Lithium Rhino’s sizes give a bit more capacity in each class: 65Ah versus 50Ah, and 120Ah versus 100Ah. For long tournament days, that extra margin matters.

Cold weather

EPOCH lists internal heating on both of its 36V models, which lets the battery accept charge below freezing. Our Lithium Rhino listings don’t show heating. If you fish early spring or late fall in the North, or charge in an unheated garage, EPOCH’s heating is a real advantage. In the South, it matters less.

Water resistance

Lithium Rhino lists IP67 on both kits; EPOCH lists IP67 on the 100Ah and IP65 on the 50Ah. All are well suited to a trolling battery compartment, but none should sit in bilge water, and terminals still need protection.

Size and weight

EPOCH’s 36V 50Ah lists a group 31 size and 35 pounds, a compact package for skiffs and smaller bass boats. The 36V 100Ah weighs 75 pounds. Our Lithium Rhino listings don’t show weights or dimensions, so check the product pages and measure your compartment before ordering.

Warranty

EPOCH lists 11 years; Lithium Rhino lists 8 years. Read each maker’s terms for what’s covered.

Charging

All four need a 36V LiFePO4 charger. Lithium Rhino lists a 50A maximum charge current, so any common onboard charger is within range. EPOCH sells a 36V 15A charger and a two-bank 12V/36V onboard charger that also handles the start battery. The Allied Lithium 36V 15A waterproof charger is another option. To add range on the water, a 12V-to-36V DC-DC charger can top up the trolling battery from the outboard.

Example decisions

Northern bass angler, 112-lb thrust motor, spring and fall tournaments: EPOCH 36V 100Ah for heating and capacity, with a two-bank onboard charger.

Florida bay boat, heavy spot-lock use: Lithium Rhino 36V 120Ah for the extra capacity; heating isn’t needed.

Small skiff, moderate use: EPOCH 36V 50Ah for its compact size, or Lithium Rhino 65Ah for more capacity if it fits.

Single case vs three 12V batteries

Both options beat a three-battery lead-acid bank on weight and steady voltage. Compared with three 12V lithium batteries, a single case removes jumpers and balance concerns and gives one Bluetooth readout for the whole bank. Three 12V batteries are easier to lift individually and fit split compartments.

Installation tips for either brand

Measure first. Check the length, width and height of the compartment, including room for cables and a hold-down strap. A single 36V case is often longer or taller than one 12V battery.
Remove the old jumpers. Take out the series jumpers between the old 12V batteries and connect the motor leads directly to the single battery.
Fuse the positive lead. Install a fuse or breaker sized for your trolling motor close to the battery. Your motor maker lists the recommended size.
Check cable size. Long runs to a bow-mounted motor need heavy cable to keep voltage drop low. Reuse the existing cables only if they’re in good condition and correctly sized.
Secure the battery. Lithium batteries are lighter but still need a tray or strap so they can’t shift in rough water.
Swap the charger. Remove the old three-bank lead-acid charger leads and install a 36V lithium charger, or a two-bank charger that handles both the trolling battery and the start battery.

Monitoring with Bluetooth

Both brands list Bluetooth monitoring. The app shows state of charge, voltage and current, which is far more useful than reading voltage on a 36V lead-acid bank. Check the app before you leave the dock and at lunch. If you’re below about half by midday, ease off the spot-lock or plan a shorter afternoon.

Products mentioned

Frequently asked questions

Which 36V lithium battery has more capacity?

Lithium Rhino’s 36V 120Ah is the largest of the four. In the smaller class, Rhino’s 65Ah beats EPOCH’s 50Ah.

Which has internal heating?

EPOCH lists heating on both 36V models. Our Lithium Rhino listings don’t show heating.

Which has the longer warranty?

EPOCH lists 11 years; Lithium Rhino lists 8 years.

Can I use my old 3-bank charger?

Not with a single-case 36V battery. Use a 36V LiFePO4 charger.

Are both waterproof?

Lithium Rhino lists IP67 on both kits. EPOCH lists IP67 on the 100Ah and IP65 on the 50Ah.