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Search on this forum - the topic has come up more than once already.
 

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You can choose whatever is convenient for you. You don't want to leave the battery cells fully charged and hot for long periods of time (possibly days, but probably weeks).

The battery management system (BMS) will attempt to keep them cool and probably doesn't let them get fully charged (100% on the gauge is probably not as full as the cells could get without the BMS).

I set hilltop reserve mode and charge every night. I plug the car in every time I park it in the garage.

Ed
 

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+2.

I've had an electric motorcycle for 3 years and it's a habit I've built.

Letting the cells balance is one reason, even when the vehicle doesn't need a charge for reasons of expected range. But the real reason is that the pain of forgetting to charge when I really needed to, is much greater than the few seconds it takes to maintain my habit of plugging in every time I return to the garage.
 

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Plug it in every night if you can. The battery management system will keep the battery pack happy while plugged in, cooling or heating the pack as necessary. If the car is going to be idle for longer than 4 weeks, the recommendation is to drain the battery to 2 or 3 bars (10 or 15 percent) and leave it UN-plugged. Under 4-weeks, leave it plugged in.
 

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Devbolt,
Yes, that's exactly what the OnStar Cadillac Concierge told me to do with my ELR last year when I went on an extended trip. I did it, and when I returned, everything was perfecto.
 
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