How complicated is it to replace the battery on a B8 A4?

[SDF1]

2009 rest in signature. It doesn't have MMI but I don't think that should matter.

Authentic Ross-tech cable?

[Ox2gen]

Authentic Ross-tech cable?

Yes, Ross-tech cable is authentic, bought it straight from them. Ran the codes and this fault code came up for Module Address 19 (CAN Gateway). Seems like something's disconnected or the battery is so dead it's not talking anymore j/k


Address 19: CAN Gateway (J533) Labels: 8T0-907-468.clb
Part No SW: 8T0 907 468 M HW: 8T0 907 468 H
Component: GW-BEM 5CAN H06 0095
Revision: GB300043 Serial number: 4300G09226845C
Coding: 000303
Shop #: WSC 02391 823 56573
VCID: 4B95D334EAC1C74084E

1 Fault Found:
00458 - Control Module for Battery Monitoring (J367)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 2
Fault Frequency: 254
Reset counter: 219
Mileage: 114362 km
Time Indication: 0
Date: 2014.04.17
Time: 16:47:57

[SDF1]

Yes, Ross-tech cable is authentic, bought it straight from them. Ran the codes and this fault code came up for Module Address 19 (CAN Gateway). Seems like something's disconnected or the battery is so dead it's not talking anymore j/k


Address 19: CAN Gateway (J533) Labels: 8T0-907-468.clb
Part No SW: 8T0 907 468 M HW: 8T0 907 468 H
Component: GW-BEM 5CAN H06 0095
Revision: GB300043 Serial number: 4300G09226845C
Coding: 000303
Shop #: WSC 02391 823 56573
VCID: 4B95D334EAC1C74084E

1 Fault Found:
00458 - Control Module for Battery Monitoring (J367)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 2
Fault Frequency: 254
Reset counter: 219
Mileage: 114362 km
Time Indication: 0
Date: 2014.04.17
Time: 16:47:57

Well you have a bigger problem!