50Ah 12V Silicon Dioxide Lead Crystal Battery SiO2


50Ah 12V EFSL SiO2 22NF  Scooters, Marine & Powered Wheelchairs Battery

1 in stock (can be backordered)

Volume Discount for 3+, 6+ 8+ and 12+!

Product Description

Ultra Long-term Solution at Short-term Cost

50Ah 12V Silicon Dioxide Lead Crystal EFSL Battery SiO2

This size battery is the  size 22NF perfect for use in scooters, marine and powered wheelchairs.
Replaces 12V 40Ah / 12V 45Ah / 12V 50Ah / 12V 54Ah / 12V 55Ah / 12V 56Ah Sizes.
Fits Most Group 21, Group 22R, Group 22F, Group 22HF, Group 22NF, Group 22R


L 222mm x W 120mm x H 178mm / L8.74″ x W 4.72″ x H 7″diagram for size of 12EFSL50 Battery


12.5kg / 27.5lbs

Terminals – M6 6mm metric bolt


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
  • 24-month shelf life without needing to refresh the battery
  • No Sulphation
  • 8-12 year service life, based on up to 30-50% daily discharge
  • Long lasting up to five times longer than AGM batteries at 50% DoD (depth of discharge)
  • 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
  • Closest Battery size U1
  • Huge range of sizes to fit every application, from scooters, wheelchairs, lifts and uninterruptable power supply systems to RVs, campers, fishing boats to large solar energy storage banks.

SiO2 Cycle Life ChartThe Silicon Dioxide 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 SiO2 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 SiO2 battery lasts 8-12 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 SiO2 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 Silicon Dioxide 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.

Settings for your SiO2 battery if you are choosing custom programming on your charge controller:

Equalizing Voltage -> 14.6 or Shut off this function if available
Boost Voltage -> 14.6
Floating Charge Voltage -> 13.6
Over-discharge Return Voltage -> 12.7
Over-discharge Voltage -> 11.8




Group of SiO2 Batteries


These are replacement batteries only. NOTE: It is your responsibility to verify the batteries being ordered match the batteries in your unit prior to placing your order. We are not responsible for incorrect orders. DISCLAIMER: Not affiliated with any scooter, wheelchair or equipment manufacturer listed above. Contact Azimuth Solar for more information on battery compatibility and to have a spec sheet sent to you. Note: F7 Terminals suitable for electric vehicle, emergency power , UPS, marine, floor cleaning machine, material handling, medical, rehabilitation, RV, Solar, Fishing

Additional Information

Battery Type

SiO2 Composite Electrolyte Battery EFSL

Nominal Capacity (25°C/77°F)

50 Ah (600 Wh) @ 20 Hour

Nominal Voltage


Charging Voltage

14.4V – 14.7V

Max Charge Voltage


Internal Resistance (25°C/77°F)

8 mΩ

Max Discharge Current (25°C/77°F)


Depth of Discharge

50% for 2,800 Cycles
80% for 1,500 Cycles

Operational Temperature

-40⁰C to 65⁰C (-40⁰F to 149⁰F)

Self Discharge

< 1.6% per Month

Life Cycle

2825 Cycles at 50% DoD; 3400 Cycles at 40% DOD; 1500 Cycles at 80% DOD; 620 Cycles at 100% DOD


L 222 x W 120 x H 178mm
L8.74" x W 4.72" x H 7"


12.5kg / 27.5lbs


Soneil International Ltd.


2 Years Workmanship Parts only – Manufacturer\\'s Warranty


M6 6mm metric bolt

12 EFSL 50 Specs

SiO2 EFSL Batteries State of Charge Chart

Silicon Dioxide 4 pager

UL Certification of Compliance

IATA Declaration

Getting the most out of your Silicon Dioxide batteries

Cycle Life and Temperature Range Comparison

Comparison of lifetime cycles of competing batteries chemistries

Comparison of Lifetime Cost of Battery at 50% DOD



You may also like…

  • 108Ah 12V SiO2 Battery G 30H EFSL

    Add to cart
  • 12V 100Ah SiO2 Battery

    100Ah 12V SiO2 Battery G27

    Add to cart
  • 12V 39Ah SiO2 Battery

    39Ah 12V Silicon Dioxide Lead Crystal U1 Battery SiO2

    Add to cart

Add to this item...

  • Sale!

    20A 12V SiO2 Battery AC Charger for Silicon Dioxide Batteries

    Add to cart