12 Volt 300Ah Lithium Deep Cycle Battery w/ Heater

  • Free shipping in the U.S.
  • 11-year warranty
  • Ships internationally to most countries


Availability: 54 in stock

Warranty: 11 Years

  • 70% lighter than lead acid batteries
  • Two to four times the service life (3000-5000 cycles)
  • Great for RV and motorhome house battery, solar power storage
  • Battery Management Systems (BMS) with power terminal cut-off and recovery
  • Our heater battery warms up the battery to enable a charger once battery is warmed up
  • 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
  • Can go up to 4 in series with this battery
  • Can be used for starting engines up to 1100A CCA equivalent
  • Comes with an 11 Year Battery Warranty to give you peace of mind with your purchase.
  • Compatible with the following chargers: Ionic, Noco Gen Pro, Dual Pro PS/ Auto, Minnkota Precision, Pro Mariner/Pro Tournament Elite, Stealth, Troll Bridge DC, Power Pole.

Product Description

Ionic Lithium Deep Cycle Battery 12V300-EP4S

The best value 12V 300ah lithium deep cycle battery on the market

rv winter vacationThe Ionic 12V 300ah Lithium Deep Cycle Battery is the most competitively priced lithium deep cycle battery on the market and also comes with an 11 Year Battery Warranty to give you peace of mind with your purchase.

World Class Safety Features

Ionic Deep Cycle 12V300-EP has 12 volts and a 300Ah capacity and is perfect for powering your deep cycle systems. Ionic Deep Cycle 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.

rv in snowy forestBuilt for Long Lasting Reliable Power

The Ionic Deep Cycle Battery has a cycle life of 3,000 cycles or about 10 calendar years. Our lithium-ion batteries have a usable capacity of 99% compared to 50-60% for traditional lead-acid batteries]. LithiumHub Deep Cycle batteries 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 Lithium Battery line has the best weight to power ratio on the market

At 20.5” (L) x 10.6″ (W) x 8.7” (H) and weighing only 83.1 lbs., the Ionic Deep Cycle 12V300-EP has the best size to power ratio of any deep cycle battery on the market. Connectors: 3/8th UNC Threads 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 14.6V and the discharge cut-off voltage is 10.5V. Max charge current is 300A and max discharge current is 200A / 350A(3s). Peak discharge current is 500A (3s). 2500W continuous, 6000W peak (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 14.4-14.6 volts will allow the battery to be fully charged. Chargers that do not exceed 13.6 volts will only charge the battery to 50% capacity or less.

Has Bluetooth connection

Has Bluetooth connection
Can be charged in series

Can 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 Battery Warranty

11 Year Battery Warranty
Model IC-12V300-EP4S
Voltage 12V
Capacity 300Ah, 3840Wh
Chemistry LiFePo
Weight 83.1lbs (37.7kg)
Dimensions 20.5″ (L) x 10.6″ (W) x 8.7″ (H) 521x269x221mm
Life Cycles 3,000 @ 80% DOD
BMS Yes (Internal)
Max Charge Voltage 14.6±0.1V
Discharge Cut-Off Voltage ~8.0V
Max Charge Current 200A
Max Discharge Current 200A
Crank Amps 1100A
Peak Current (3S) (450A)(3S)
Operating Temperature -20~60℃
BCI Group Size 31
Terminal 3/8 UNC Thread

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

Customer Reviews

Don't just take our word for it! See real feedback from our customers

Customer Reviews
5.0 Based on 3 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
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Craig D.
I recommend this product

Nothing But Positive Results

I have installed many of the 300ah batteries and all the customers seem to really like them. They not only perform well in the marine environment but the Bluetooth information that they provide gives the customer the piece of mind they are looking for.

David F.
I recommend this product

great battery

I had one and purchased a second one for 600amp hours of battery power for my RV. Combined with my solar this powers the entire RV without any need for outside power source. After a year with the two batteries I have had no issues with power to include rainy days with little sun. No worries with them. I’ve personally recommended them to a number of people I have come across.

David Schofield

After looking at numerous battery manufacturers, I am pleased with the 300ah LithiumHub I purchased for my custom Class B camper. Unlike other batteries that are limited to 100 amp hours, the 200ah discharge rate allows me to use my 1800 watt induction cooktop and other electrical devices without a problem. As I use the camper all year round, the BMS and built in heater is ideal for using the battery during cold weather. Additionally the Bluetooth app has been great for monitoring the SOC and power consumption of the various electrical equipment. Would highly recommend this battery for anyone with a camper.

12 Volt 300Ah Lithium Deep Cycle Battery w/ Heater has a rating of 5.00 stars based on 3 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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