36 Volt 50Ah Lithium Battery

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11-year warranty


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  • 70% lighter than lead acid batteries
  • Two to four times the service life (3000-5000 cycles)
  • Comes with an 11 Year Battery Warranty to give you peace of mind with your purchase.
  • Great for marine trolling and other 36V systems
  • Battery Management Systems (BMS) with power terminal cut-off and recovery
  • Built in cold weather protection – Does not take a charge if temperatures are below -4C or 24F in our case. Some variations with part tolerances.
  • Cell balancing and low voltage/over voltage protection, short-circuit protection
  • Bluetooth technology to monitor battery status
  • Maximize your energy potential with 99% Depth of Discharge (DOD)
  • Drop in replacements (plug and play)
  • Run as many needed in parallel
  • Compatible with the following chargers: Ionic, Noco Gen Pro, Dual Pro PS/ Auto, Pro Mariner/Pro Tournament Elite, Stealth, Troll Bridge DC, Power Pole.


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Product Description

Ionic Deep Cycle Lithium Battery 36V50-EP

World Class Safety Features

Ionic Deep Cycle 36V50-EP has 36 volts and a 50Ah capacity and is perfect for powering your deep cycle systems. This Ionic battery has an internal microprocessor controlled battery management system (BMS) that monitors the key operational parameters during charging and discharging, such as voltages, currents and internal temperatures. Ionic batteries can be hooked as many needed in parallel.

Built to Last Longer, With Reliable Power

The Ionic deep cycle battery has a cycle life of 3,000 cycles or about 10 calendar years. Our 36V lithium batteries have a usable capacity of 99% (compared to 50-60% for traditional lead-acid batteries). Our 36V batteries also function in the widest range of temperatures with a discharge temperature range (Functional) of –20°C to 60°C (–4°F to 140°F) and a charge temperature range of 0°C to 45°C (32°F to 113°F). Automatically detects if batteries are too cold to take a charge.

The Ionic Deep Cycle 36V Lithium Battery has the best weight to power ratio on the market

At 19.1” (L) x 6.7″ (W) x 9.5” (H) and weighing only 45lbs, this battery has the best size to power ratio of any deep cycle battery on the market. Connectors: 3/8 allow the battery to be installed in any direction unlike lead-acid batteries which are fixed. Ionic deep cycle batteries self-discharge rate per month is between 1-3% compared to lead-acid batteries which are about 30%. Max charge voltage is 43.8V and the discharge cut-off voltage is 31.5V. Max charge current is 60A and max discharge current is 60A / 350A(3s). Can be charged with solar chargers. Can be charged with most traditional lead-acid chargers that do not have “Desulfate” mode, provided the current levels do not exceed lithium battery charge specification. Using a traditional lead-acid charger that reaches 41.4-42.3 volts will allow the battery to be fully charged. Chargers that do not exceed 40.8 volts will only charge the battery to 50% capacity or less.

Real-Time Battery Monitor

Now you can get instant access to your most important battery information, right in the palm of your hand. Monitor your battery status in real-time on your phone, with the Ionic Blue Batteries app. It’s smart energy monitoring at it’s best – instant, real-time battery status, right in your pocket.

Has Bluetooth connection

Has Bluetooth connection
Can be charged in series

Can NOT be charged in series
Can be charged in parallel

Can be charged in parallel
Free Shipping

Free Shipping
Lithiumhub 30 Day Return Policy

30 Day Return Policy
11 Year Limited Warranty

11 Year Battery Warranty
Model IC-36V50-EP
Voltage 36V
Capacity 50Ah, 1280Wh
Chemistry LiFePo4
Weight 45lbs (20.5kg)
Dimensions 19.1″ (L) x 6.7″ (W) x 9.5″ (H) 484x170x241mm
Life Cycles 3,000 @ 80% DOD
BMS Yes (Internal)
Max Charge Voltage 43.8±0.1V
Discharge Cut-Off Voltage ~24.0V
Max Charge Current 25A
Max Discharge Current 60A
Peak Current (3S) (350A) (3S)
Operating Temperature -20~60℃
Terminal 3/8-16 UNC
Water Rating Water Resistant

Please read our frequently asked questions page for answers commons questions regarding lithium ion batteries.

Ionic Deep Cycle Manual

Spec Sheet

Bluetooth Guide

Performance Curve

Safety Data Sheet

Customer Reviews

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Customer Reviews
5.0 Based on 53 Reviews
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Filter Reviews:
Jeffery W.
I recommend this product

36V 50 Lithium Battery

Great service, great battery!

Jim M.
I recommend this product

36 volt 50AH

this battery is great last forever way better than my LBP battery and I love the app being able to see the charge is a game changer this is my second Battery my other one is a 12v house battery and they both rock.

George A.
I recommend this product

36volt battery

I used this battery for the first time last weekend on a 4 day fishing trip and I can’t be happier with it. I was on my trolling motor pretty much all day everyday and didn’t have to charge it the whole trip! Outstanding battery and well worth the investment

Chris g.
I recommend this product

Must purchase

Battery meeting every bit of what I was promised and expected

Jason O.
I recommend this product

Meets expectations!!!

I have used my trolling motor for three consecutive 8-10 hour fishing days and still have 70% battery left. More than meets expectations Garmin Force.

36 Volt 50Ah Lithium Battery 4.98 stars 48 reviews.

experience the advantage of ionic brand lithium batteries

3 blue LithiumHub Ionic batteries.

11 year

Buy with confidence with our competitive no-nonsense 11 year warranty.

grade a
cells only

Ionic uses the best cells so your battery lasts longer and performs better.


Monitor your charge at any time from our user-friendly Ionic mobile app.

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get the battery of tomorrow, today


50 percent lighter


zero maintenance


2x the power


5x faster charging

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