AUX18L Auxiliary and Start/Stop Battery, by East Penn

Part Number

The AUX18L, by East Penn / Deka, is found in hybrid and start-stop vehicles to act as an auxiliary power source to maintain power to vehicle electronics. The AUX18L is a factory installed battery in many hybrid and start-stop foreign and domestic vehicles.


  • Premium AGM Technology
    • Superior glass mat electrolyte retention and protection against vibration maximizes long-term capacity.
  • Individual Cell Venting System
    • Optimized valve-regulated and internal moisture creation process extends battery performance at maximum efficiency.
  • 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. 

The AUX18L is the original equipment replacement auxiliary battery for the BMW i3. 

More Information
Part Number AUX18L
Battery Voltage 12 Volt
Cold Cranking Amps 300 CCA
Amp Hour Rate 20 Ah
Battery Type Sealed Maintenance Free
Battery Chemsitry AGM (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
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