Editing Openai/6940b2df-db80-8003-b707-4cc5cbedf6d9 (section)

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# Ignition OFF. 461232-BMW_3-Series_E90-E91_200…
# Open the trunk battery compartment and remove the right-side trim panel (plastic retainer). 461232-BMW_3-Series_E90-E91_200…
# Remove the protective bracket over the battery (remove mounting fasteners) and lift it off. 461232-BMW_3-Series_E90-E91_200…

===== 1. At the battery, disconnect the negative (–) cable first by loosening fastener “A.” 461232-BMW_3-Series_E90-E91_200… - Important caution: the IBS (intelligent battery sensor) is on the negative cable. Do not pull, pry, or lever on the IBS/ground cable assembly. 461232-BMW_3-Series_E90-E91_200… =====
# Unlock/open the BST plastic cover, then loosen the positive (+) cable fastener “B.” 461232-BMW_3-Series_E90-E91_200…
# Carefully lift off the rear power distribution panel (A46) together with the positive cable, negative cable, and IBS, and set it aside. 461232-BMW_3-Series_E90-E91_200…
# Remove the battery hold-down bolt “C.” Disconnect the battery vent hose. Lift the battery out. 461232-BMW_3-Series_E90-E91_200…

===== 1. With A46 off the battery, transfer each cable/connection from the old panel to the new panel one-by-one (so nothing gets mixed up). - Bentley notes the high-amperage fuses in this panel are fusible links and aren’t replaceable separately, which is why a melted/warped unit typically gets replaced as an assembly. 461232-BMW_3-Series_E90-E91_200… =====
# Inspect every ring terminal and stud for heat damage/discoloration. Any burnt/blue/pitted connection should be corrected now, or it’ll cook the new panel.

===== 1. Reinstall the battery (vent tube connected, hold-down installed). =====
# Reinstall the A46 panel and cables back onto the battery.
# Reconnect positive (+) first, then negative (–) last. 461232-BMW_3-Series_E90-E91_200…
# Torque the battery terminal clamp bolts to spec:
* M6 terminal bolts: 5 Nm (44 in-lb)
* M8 terminal bolts: 15 Nm (11 ft-lb) 461232-BMW_3-Series_E90-E91_200…
# Reinstall the protective bracket and the trim panel you removed earlier. 461232-BMW_3-Series_E90-E91_200…

===== 1. If the battery was replaced or its rating/type changed, Bentley notes you may need CAS recoding + battery registration. 461232-BMW_3-Series_E90-E91_200… =====

If you tell me whether your battery is in the trunk on the right side (most E90s) and whether your new A46 has the same number of studs/outputs as the old one, I’ll also give you a clean “transfer map” checklist so you can move each cable in a no-mistakes order.