Not a good topic to discuss.
Use common sense. Also, it should be hard wired so it should be automatically charged. When thieves disconnect your battery, at that time built in battery will play its role.
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F36 Xdrive for her - HUD, park assist, heated steering wheel, rear camera, Apple car play
F36 RWD for him - HK, M sports pack, GTS tail light, Apple car play
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