Yourpersonal car expenses manager, maintenance tips, reminders about upcoming appointments and service intervals, DIY repair instructions – all this on your phone. How often to change the Battery on your AUDI E-TRON . Recommended service and replacement schedules every 70000 km / every 36 months. A3 A6 TT A5 A1 A8 Q5 Gellcell or VRLA batteries would cost about 1.5-2x more. You can buy an equivalent unit from another brand with the [u]same dimensions, terminal size, -ve terminal polarity (L or R) and capacity (72 AH). If this isn't available from Exide/Amaron/Tata Green then your only option is to go for a battery from the dealer. ReBjG.