300AH 12V LifePO4 Lithium Leisure Battery
300AH 12V LifePO4 Lithium Leisure Battery - Image 2
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300AH 12V LifePO4 Lithium Leisure Battery - Image 4
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300AH 12V LifePO4 Lithium Leisure Battery - Image 6
300AH 12V LifePO4 Lithium Leisure Battery - Image 7

300AH 12V LifePO4 Lithium Leisure Battery

£550.00 Inc. VAT

Our premium 300Ah battery delivers exceptional power for its size, with a continuous charge/discharge rate of 250A—perfect for even the most demanding applications.

Built with an advanced BMS and the highest quality Grade A+ cells, it ensures full protection and optimal performance. With excellent balance throughout its 10+ year lifespan, it provides stable and high power for your off-grid system.

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Quick Specs
  • ▪️ Capacity: 300Ah
  • ▪️ Energy: 3840 kWh
  • ▪️ Voltage: 12.8V
  • ▪️ Cells: Prismatic “A” 3.2V100Ah 4S2P
  • ▪️ Charge Current: 250A
  • ▪️ Discharge Current: 250A
  • ▪️ Max Discharge: 400A (10s)
  • ▪️ Dimensions: 520L x 269W x 220H mm
  • ▪️ Weight: 28kg
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5 Year Warranty

Rest easy with our outstanding and reliable warranty coverage.

STORE, USE AND SAVE

Our 300Ah model can store up to 3840Wh of energy, generated from solar panels, the mains, or your engine. Use this power to run all your devices day and night, or whenever you need to go completely off-grid.

This model is ideal if your current battery isn’t meeting your energy needs. Perfect for larger solar systems, powering your campervan, or any remote off-grid installation where reliable stored energy is essential.

PROPER POWER. SUPERIOR SAFETY.

Our batteries come with an In-Built Battery Management System (BMS) which protects against overcharging, short-circuits, and temperature extremes, ensuring peace of mind and a long-lasting battery with excellent performance for over 10 years.

Not all lithium chemistry is created equal, and Voltanic uses the safest and most advanced of them all—Lithium Iron Phosphate (LiFePO4). With its unmatched chemical stability and exceptional energy density, LiFePO4 sets the standard for reliability and performance.

Crafted with the highest quality matched Grade A cells and assembled with metal brackets, Voltanic batteries are built to deliver consistent, high power.

SCALABLE POWER

Add extra batteries anytime

You can install up to 4 batteries in series or 16 in parallel, offering a wide range of voltage options and extra capacity.

COMPACT AND VERSATILE

Designed to Fit

Fit your voltanic battery into any space, in any direction. Our user-friendly handle and IP65 waterproof rating provide extra comfort.

Fit your voltanic battery into any space, in any direction. Our user-friendly handle and IP65 waterproof rating provide extra comfort.

THE POWER OF 300AH

135
slices of toast
160
cups of tea
72
hours of laptop use
345
phone recharges
135
minutes of hair drying
9
days mini-fridge

WHY YOU MUST
UPGRADE TO LIFEPO4

Our LiFePO4 batteries are better than lead-acid and AGM in almost every way – they last 10x longer, charge twice as fast, weigh half as much, are safer. They come fully charged and ready to install, designed to withstand 3,000 charge cycles at 80% DoD, making them the highest performing and longest-lasting batteries for any off grid set-up.

Battery Comparison Chart
Feature LiFePO4 AGM Flooded
Cycle Life
(50% Discharge)		 ✅6,000 ❌500 ❌300
Weight ✅10kg ❌22kg ❌26kg
Charging Time ✅2–4h ❌6–8h ❌8+h
Discharge Depth ✅100% ⚠️80% ❌50%
Maintenance
Required		 ✅No ✅No ❌Yes
Orientation ✅Any ✅Any ⚠️Upright
Only
Vibration
Resistance		 ✅High ✅High ❌Low
Toxicity ✅None ⚠️Lead+Sulfur ⚠️Lead+Sulfur
Safety ✅BMS ⚠️None ⚠️None

SAFETY AT VOLTANIC​

Safety is our top priority. Starting with the selection of safe and tested Grade A cells from leading brands, we ensure secure handling and delivery by partnering with certified couriers experienced in transporting sensitive goods.

Our import processes adhere to strict safety standards, and every battery undergoes rigorous testing to identify and address any potential issues. Our products also meet essential certifications, including CE, UKCA, and RoHS, ensuring compliance and reliability.

FAQ

A 12V 300Ah LiFePO4 leisure battery gives you roughly 3600 usable watt-hours of energy (12V × 300Ah = 3600Wh). To figure out how long it will run for, simply add up the watts of all your devices and divide 3600 by that number.

General Guideline:

  • 100W usage (small TV, lights): ~36 hours
  • 200W usage (TV, laptop, lights): ~18 hours
  • 500W usage (small heater): ~7.2 hours
  • 1000W usage (microwave, kettle): ~3.6 hours

Remember: Actual runtime will vary based on temperature, battery age, and the type of devices being powered.

Using the Voltanic 200W Solar Panel as an example, the module itself generates around 10 amps per hour in peak sunlight. Since a 300Ah battery needs 300 amp-hours to charge fully, it would theoretically take 30 hours of perfect sunlight to charge it up. However, you typically only get 4-6 hours of good sun per day (in the spring & summer), so expect about 5-8 days for a full charge with a 200W panel.

General Guide:

  • Basic setup: 200W panel (~5-8 days to charge)
  • Better setup: 300W panel (~3-5 days to charge)
  • Optimal setup: 400W+ panel (~2-3 days to charge)

Remember: Always use an MPPT solar charge controller between your panels and battery to generate the most power and ensure efficient charging.

A typical 12V camping fridge uses around 2-4 amps per hour (24-48 watts) when the compressor is running. However, fridges don’t run constantly—they typically cycle on and off to maintain temperature, running about 30% of the time in normal conditions. This means they average 0.6-1.2 amps per hour (7-14 watts).

Runtime Guideline:

  • Average conditions: ~7-10 days runtime
  • Hot weather (more cycling): ~4-6 days runtime
  • If running constantly: ~60-90 hours

Remember: These are estimates—actual runtime depends on ambient temperature, how often you open the fridge, how full the fridge is, and the efficiency of your system.

The key factor to consider is your battery’s continuous discharge current rating. This is the amount of current (or amps) the battery can safely discharge continuously during daily use. Your 12V 300Ah LiFePO4 battery has a continuous discharge rating of 250A or 3000 Watts (250A × 12V = 3000W).

Therefore, you should not use devices that continuously draw more than 3000 watts, making a 3000W inverter perfect for your setup.

Note: You can technically use larger 4000-5000 watt inverters on your 12V 300Ah battery, as running an inverter at 50-60% capacity (rather than at full load) can actually extend its lifespan. Just remember to never exceed the continuous discharge current limit, or you risk reducing the lifespan of your battery and possibly damaging it.

Remember: Always choose a pure sine wave inverter for optimal performance.

Yes, most standard 12V lead-acid chargers can safely charge LiFePO4 batteries since they charge at similar voltages (around 14.4V). However, there are a few things to consider:

Good to know:

  • Lead-acid chargers typically charge at lower currents, so charging will be slower
  • You may not achieve 100% charge
  • Avoid chargers with “desulfation” or “recovery” modes that use high voltage

For best results:

  • Use a proper LiFePO4 charger for faster charging and optimal battery life
  • If using a lead-acid charger, make sure it doesn’t exceed 14.6V
  • Check that your charger doesn’t have aggressive equalization modes

 

Remember: While lead-acid chargers will work, a dedicated LiFePO4 charger is a better long-term investment for optimal battery performance and lifespan.

LiFePO4 batteries require a specific charging profile to ensure safe, efficient charging and maximum battery life. You have several charging options:

  1. LiFePO4 Battery Charger (Wall Outlet)
  2. Solar Panels
  3. Use a DC-DC charger designed for LiFePO4

Remember: Always match charging voltage (14.4V-14.6V)

Technically yes, a split charge relay could work to charge a LiFePO4 battery since alternators typically output 14.4V, which is within LiFePO4’s charging voltage range. However, it’s not recommended because:

  • Alternator voltage can spike and fluctuate (especially in modern vehicles)
  • No protection against overcharging
  • No temperature monitoring
  • Could potentially void battery warranty
  • May cause premature battery wear

Better solution:

  • Use a DC-to-DC charger designed for LiFePO4
  • Provides proper voltage regulation
  • Includes safety features and proper charging profile

While a split charge relay might work in a pinch, investing in a proper DC-to-DC charger will protect your battery investment and ensure safe, efficient charging.

SPECS

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Most solar kits have a dirty little secret they don't tell you about:
They waste valuable power.
Here's the deal

12V solar panels actually output around 20V

12V leisure batteries charge at just over 12V*

Standard PWM controllers simply drop those extra 8V — throwing away precious power

In cloudy Britain where every watt counts, this is a problem.
The Voltanic Difference

Every Voltanic Kit takes those wasted volts and converts them into extra amps using Advanced MPPT (Maximum Power Point Tracking) Technology.

Harvest 100% of your Solar Energy - No wasted watts

Charge your Batteries 30% Faster

More Power, Fewer Panels - Perfect for tight spaces

Better Value Investment - Get what you pay for

Maximum Power. Zero Waste.
24V 20V 16V 12V 8V 20V Input 12V Output 8V Wasted as Heat
24V 20V 16V 12V 8V 20V Input 12V Output Converting to Extra Amps
Real World Comparison:
100W Panel Performance
Watts = Volts x Amps
Controller Standard PWM Voltanic MPPT
Panel Voltage 20V 20V
Controller Charging Voltage 12V
(PWM reduces voltage)		 12V
(MPPT reduces voltage)
Amperage 5.8A
(amps stays same)		 8.2A
(MPPT increases amps)
Power Output 12V × 5.8A = 70W 12V × 8.2A = 98W
Power Wastage ~30W
(lost as heat)		 ~2W
(conversion loss)