12V 270Ah SiO2 Battery 8D Marine & Energy Storage

$2,034.17 $1,830.75

12V 270Ah EFSN SiO2 Battery

49 in stock (can be backordered)

Discounts offered on bulk buys of 2+ and 8+ batteries!

Product Description

Ultra Long-term Solution at Short-term Cost: 8D 12V 270 Ah SiO2 Battery

In Stock now!

FREE Pick up available in Brampton, Ontario or Kelowna, BC. FREE or low cost shipping to Southern Ontario or the Central Okanagan. CALL 236-420-4228 for custom ship quote! This item ships freight on a pallet. Someone must be there to sign for the shipment.  Pick up must be scheduled in advance.

  • EFSN
  • Terminal F4

Why you need to change your battery today.

  • Suitable for tough weather conditions with stable performance under extreme cold (down to -40C) or dry heat (up to 65 degrees Celsius)
  • 2 years Warranty
  • 12-month shelf life without needing to refresh the battery
  • No Sulphation
  • 8-12 years of battery life
  • Full recovery after a deep discharge
  • High cycle life – 2800 Cycles at 50% DoD
  • Environmentally friendly
  • Safe to transport by air
  • No leakage and very low gassing compared to Lead Acid Batteries
  • 99% Recyclable
  • 8D size
  • Huge range of sizes to fit every application, from scooters, wheelchairs, lifts and uninteruptable power supply systems to RVs, campers, fishing boats to large solar energy storage banks.
  • Bulk discount available for purchases of 8 or more 270Ah batteries. 
    SiO2 Cycle Life Chart

The Ultra Long Life Battery is a high performance battery comparable to Lithium-Ion in both depth of discharge and cycling capabilities for a third of its price. It even out-competes many similar Li-Ion batteries in longevity when subjected to the same discharge, temperatures, and partial state of charge abuse.

This means the ULL Battery boasts a fantastically low cost per Kilowatt-Hour over its entire lifetime. Each cent gives users more watts for longer to provide the best long-term solution with short-term costs. It even has a longer shelf life, only discharging less than 1.6% of its power over a month.

The Ultra Long Life battery lasts 10-15 years, depending on use, thanks to its unique chemistry. The pH neutral electrolyte prevents sulphation and does not corrode the internal components.

Cold Weather Champion

The ULL Battery’s effectiveness in extreme temperatures stands out against all competition. The cold-resistant technology was developed for use in machinery up North and performs far better than any other battery technology on the market.

These batteries provide 40% more power than lead-acid battery at temperatures as low as -40 °C/F.

Safer, Easier, and Greener

The Ultra Long Life battery is lighter weight than other types of Lead-Acid batteries and is easier to transport and install since it can be placed on any side or orientation.

These batteries are up to 99% recyclable and an excellent battery for environmentally-conscious users wanting to minimize the carbon footprint of their solar array.

These deep cycle batteries require no maintenance and are non-gassing. This makes them safer in high temperatures or remote battery banks and backup power storage. It is safe for air travel and can be used as marine batteries.


battery chart comparing cycle life and temperature range

Battery Lifetime Cycle Comparison Chart chart comparing lifetime costs of different battery chemistries

Additional Information

Battery Type

SiO2 Composite Electrolyte Battery EFSN

Nominal Capacity (25°C/77°F)

270 Ah (3240 Wh) @ 20 Hour

Nominal Voltage


Max Charge Current


Max Charge Voltage


Internal Resistance (25°C/77°F)

2.8 mΩ

Max Discharge Current (25°C/77°F)


Depth of Discharge

100% DOD

Operational Temperature

-40⁰C to 65⁰C (-40⁰F to 149⁰F)

Self Discharge

< 1.6% per Month

Life Cycle

3400 Cycles at 40% DOD; 1500 Cycles at 80% DOD; 620 Cycles at 100% DOD


26.9 x 52 x 23.1 cm (10.59 x 20.47 x 9.09")


70 kg (154.5 lbs)


Soneil International Ltd.


2 Years Workmanship

Spec Sheet

Cycle Life and Temperature Range Comparison 2nd option

Comparison of Lifetime Cycles of Competing Battery Chemistries

Comparison of Lifetime Cost of Battery at 50% DOD

SiO2 EFSN Batteries State of Charge Chart

Charging Instructions