Disconnecting the negative terminal of the battery might cause some data loss, such as radio presets or clock settings, but it generally won't cause any damage.

After the battery of the 2015 MG GS 2.0T was discharged, the electronic parking system malfunctioned, and the electronic handbrake couldn't be released. Attempts to disconnect the negative terminal and force contact were ineffective!

If the car wasn't completely stopped before shifting into reverse and you heard a grinding noise, it could potentially cause damage. It's generally recommended to ensure the vehicle is fully stationary before changing gears to avoid any harm to the transmission system.

Will disconnecting the battery for a long time in a 301 cause damage to the ABS pump? [Cheers]

Can the 2016 imported Outlander be disconnected from power for a long time? I saw online that it might cause data loss.