Developed & Manufactured In-House
KickAss ULTRA-X Lithium Batteries are developed and manufactured in-house at our own battery factory, giving us complete quality control.
KickAss Smart 12V 300Ah Ultra-X Lithium Compact Deep Cycle Battery LiFePO4 - Series 2
Club Price
$
1695
Pre-Order
Fast Dispatch
30 Day Returns
300A Continuous Discharge - Runs High Powered Devices
Versatile Installation Options – Install Under Beds, Below Seats, In Ute Tubs, etc.
Remote Monitoring via Bluetooth & Optional Remote Display
IP65 Rated with Tough Metal Exterior
7 Year Warranty
Pre-order estimated arrival date 16 October 2026
Pre-orders close in . This product will ship within 2 days of the pre-order estimated arrival date.
7 year Warranty
This product is covered by a 7 Year Limited Warranty.
About This Item
The first in the new generation of Ultra-X batteries, this 300Ah lithium power house packs 300Ah of usable capacity into a compact design that can be installed anywhere from under beds in caravans to the back of ute tubs. Connect up to four in parallel or series & monitor the entire battery bank remotely via Bluetooth – no external shunt required. Supports AS/NZS:3001 compliance.
Why Choose ULTRA-X?
Built, tested and supported by Australia’s off-grid adventure specialists.
Tested In-House & Proven in the Field
Every KickAss lithium battery is rigorously tested in-house and in real off-grid conditions, and certified to meet the highest Australian standards.
5 Year Full Warranty
Backed by a 5 year full warranty and serviced Australia-wide for total peace of mind.
Built for Safety & Performance
A-grade prismatic cells and an intelligent BMS deliver dependable power with integrated safety protection.
Lifetime Customer Support
Get ongoing support online, in-store, or through our Australia-wide network of 150+ installers.
FEATURES
300Ah Useable Capacity + 300A Continuous Discharge
With a huge 300Ah of usable capacity and a massive 300A continuous discharge, this battery has the power to run everything from fridges and lighting through to high-demand appliances and inverter setups. Stay off-grid for longer without compromising on performance.
Compact Design with Versatile Installation Options
The compact footprint makes it easy to fit this battery where larger batteries simply won't go. Install it under beds, beneath seats, inside canopies, in ute tubs or other tight spaces to make the most of every centimetre of available room.
Bluetooth Battery Monitoring
Keep an eye on your battery straight from your smartphone using the KickAss app. Check remaining capacity, voltage, current, temperature and more in real time, so you always know exactly how much power you have available.
Optional Remote Display
Prefer a dedicated display instead of checking your phone? Simply add the optional KickAss Remote Display to monitor your battery at a glance, with all your key information available wherever it's most convenient to mount.
Parallel & Series Configuration
Need even more power? Connect up to four 300Ah Ultra-X batteries in series or parallel to build a battery bank that suits your setup.
Monitor your Entire Battery Bank – No External Shunt Required
Unlike many battery systems, there's no need to install a separate external shunt to monitor your battery bank. The KickAss app and Remote Display can monitor your connected batteries together, giving you a clear picture of your available power with a simpler, cleaner installation.
Create a fully AS/NZS:3001 Compliant Setup
Designed with a built-in vent, this battery supports AS/NZS:3001 compliant installations, making it suitable for use inside caravans, campers and other enclosed spaces.
Tough Metal Housing with IP65 Rating
The rugged metal casing protects the battery from knocks and vibration, while the IP65 rating helps keep out dust and water splashes. Whether you're touring, working or camping, it's built to handle real-world Australian conditions.
Intelligent BMS
The advanced Battery Management System constantly monitors the battery to protect it from overcharging, over-discharging, short circuits and excessive temperatures. It keeps your battery performing at its best and helps maximise its lifespan.
Integrated Low Voltage Recovery (LVR) Button
If the battery has been over-discharged and the Battery Management System enters protection mode, simply press the integrated LVR button to wake it up again. It's a quick, convenient recovery feature that can save time and get you back up and running sooner.
What’s Included
- 1 x 300Ah Ultra-X LiFePO4 Battery
- 2 x Long Side Mounting Bracket
- 2 x Short Side Mounting Bracket
- 16 x Bracket Screw
SPECIFICATIONS
Technical Details
| Voltage | 12.8V |
| Capacity | 300Ah |
| Cell Type | Prismatic |
| Max Continuous Discharge | 300A |
| Max Continuous Charge | 250A |
| Peak Discharge | 660A @ 30 Seconds |
| Max Charge Temp | 60°C |
| Min Charge Temp | 0°C |
| Max Discharge Temp | 65°C |
| Min Discharge Temp | -20°C |
| Cycle Life | 4000+ |
| Bluetooth | Yes |
| Remote Display | Optional |
| Parallel / Series Remote Monitoring | Yes, up to 4 |
| Dimensions (Battery with terminals) | 242 x 180 x 460 |
| Dimensions (With Mounting Brackets) | 242 x 180 x 500 |
| Weight | 30kg |
| Certifications | IEC 62619, UN38.3, FCC, EMC |
User Manual & Support Docs
Detailed Description
The KickAss Smart 12V 300Ah Ultra-X Lithium Compact Deep Cycle Battery LiFePO4 is the first battery in the next generation of our premium Ultra-X range. Building on everything customers already love, Generation 2 introduces a new look along with key upgrades including an IP65-rated enclosure, integrated Low Voltage Recovery (LVR) button and AS/NZS 3001.2 compliant design. It's the next evolution of KickAss Ultra-X Lithium Batteries, delivering the same premium performance with even more capability.
The KickAss Smart 12V 300Ah Ultra-X Lithium Compact Deep Cycle Battery LiFePO4 is the latest addition to the premium KickAss Ultra-X battery range, delivering exceptional capacity, high current output and advanced monitoring in a remarkably compact package.
With 300Ah of usable capacity and a 300A continuous discharge, it's built to power demanding off-grid setups, making it the ideal battery to pair with a 3000W inverter for running fridges, induction cooktops, coffee machines, power tools, lighting and other 12V and 240V appliances at the same time. This high-performance 12V lithium battery gives you more power without taking up valuable space.
Its compact form factor opens up installation options that simply aren't possible with many large-capacity batteries. Mount it neatly beneath caravan beds or bench seats, inside ute tubs under roller covers, within canopies, camper trailers or enclosed marine applications. A built-in vent makes the battery AS/NZS 3001 compliant for internal caravan installations, while the rugged metal housing, IP65 rating and intelligent Battery Management System ensure reliable performance in harsh Australian conditions.
Bluetooth monitoring lets you check battery status, capacity, voltage, temperature and current directly from your smartphone, while the optional Remote Display provides the same information for those who prefer a dedicated screen. If you accidentally run your battery too flat, then the integrated Low Voltage Recovery (LVR) button makes it easy to reawaken the BMS after an over-discharge, helping you get back on the road with the touch of a button.
As your power needs grow, your battery system can grow with them. Connect up to four Ultra-X 300Ah lithium batteries in series or parallel to create a powerful battery bank, then monitor the entire system through the KickAss app or Remote Display without needing an external shunt. The KickAss Ultra-X 300Ah LiFePO4 Battery delivers a cleaner, simpler and smarter way to build a scalable off-grid power system.
