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QuestionOutcome
Do we need a microcontroller?Ideally, no. We don't need to broadcast any CAN messages.
What kind of protection do NiMH battery packs need?Under voltage over the entire pack only. We will charge the NiMH cells at a constant C/20 rate such that they will self-balance over a slow charge cycle. Ideally the auxiliary battery will not be run for a long time so discharge balancing is not a concern. Overvoltage in NiMH at C/20 is not a concern. Temperature protection is not a concern.
How do we charge the auxiliary battery pack?The auxiliary pack will be charged from the LV (12V) DC power rail in the car. A charge controller IC will be needed that will provide a NiMH charge profile.
What is the NiMH charge profile?
In what conditions will we use the auxiliary battery pack? How long will it be used? What is the current draw?
What kind of communication does the auxiliary battery pack need with the system? How do we know when to switch in/out? How do we notify the system that the battery level is low?

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