Just FYI, East Penn Manufacturing makes the original OEM 12 volt battery in the BMW i3 .
The Deka AUX18L IS the original factory i3 12 volt battery in every new i3.
Look at the manufacturer's tag on your OEM i3 BMW battery.
It says "Produzido por E.P.M. Products"
Which translated is Produced by East Penn Manufacturing Products
And check out the address of "E.P.M."on the tag - 1 Deka Rd, Lyon Station, PA 19536
Also, East Penn has warehouse outlet stores in major cities in the U.S. where you can buy the battery over the counter.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE