AUX18L Auxiliary and Start/Stop Battery, by East Penn

The AUX18L battery is currently on backorder due to manufacturer delays. You may place an order to reserve an AUX18L in advance of our next shipment.


The Intimidator ETX9 is an advanced factory activated AGM (Absorbed Glass Mat) battery with superior vibration resistance, spill-proof / leak proof and has low self-discharge for long, off-season storage. Because the ETX9 was engineered specifically to withstand engine vibration, off-road and on-water use it is the perfect battery for motorcycles, ATV's, UTV's, snowmobiles and personal watercraft.

Made in the USA - by purchasing the Deka Intimidator ETX9 you are supporting American manufacturing.


  • Safety Relief Valve System
    • Ensures no acid leaking and extends battery performance
  • Molded Top and Side Connection Terminals
    • Provides easy installation, increased strength and durability
  • Fortified Posts, Straps and Welds (internal)
    • Aides in resisting vibration and maximizes current transfer
  • Heavy-Duty Power-Performance Plates
    • Optimizes the battery's power and energy capacity
  • Enhanced Electrolyte Suspension System
    • Electrolyte / Acid is completely absorbed for a completely spillproof design
  • Optimized Component Compression
    • Tightly packed plates and separators further aid in vibration resistance


  • Stainless Steel Terminal Bolts
  • Brass Spacers for Side Terminal Connections

The AUX18L is an advanced factory activated AGM (Absorbed Glass Mat) battery with superior vibration resistance, spill-proof / leakproof and has low self-discharge. This battery is the OEM, factory installed battery found in the BMW i3.






Cold Cranking Amps


Amp Hour

Pennsylvania, USA

The ETX9 is Proudy Made in the USAThe ETX9 is Proudy Made in the USA


  • Premium AGM Technology
    • Superior glass mat electrolyte retention and protection against vibration maximizes long-term capacity
  • Individual Cell Venting System
    • Optimized valve-regulation and internal moisture creation process extends battery performance at maximum efficiency
  • Exclusive Molded Terminal Design
    • Ensures best electrical connection and the spill-proof durability critical
      for the variability of installation locations required
  • Reinforced Poly Composite Case and Cover
    • Resists heat and damage while enhancing internal compression to extend life
  • Power-Perform, Full-frame Plates
    • Combine a highly efficient current network with high-energy storage to optimize power performance







More Information
Part Number AUX18L
UPC 0 83996 04888 1
Battery Voltage 12 Volt
Cold Cranking Amps 300 CCA
Capacity 20 Ah
Battery Type Sealed Maintenance Free
Battery Chemistry Absorbed Glass Mat
Includes Acid Pack Factory Activated
Battery Length 8-1/8"
Battery Width 3-9/16"
Battery Height 6-3/8"
Warranty 1 Year
Customer Reviews
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Customer Questions
Does this battery fit an BMW i3 built 2014
Yes, the AUX18L is the correct replacement battery for your BMW i3
Does this battery fit an BMW i3 built 2017
Yes, the AUX18L is the correct battery for a 2017 BMW i3.
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