Battery

[Csvt18]

I’m disconnecting battery to attach ditch lights. Read somewhere on the 21+ if you just reconnect old battery you don’t have to do a bms reset but when you reconnect let it sit for 8 or more hours after? Why is this?

Also do I really need to disconnect battery just to add these? Would I be safe in just attaching the positive first then negative wire from harness?

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