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The manual says for extended storage leave the battery at a low state of charge. For a car driven only once or twice a week, rather than leaving it fully charged and plugged in...... Thoughts on plugging it in and using delayed charging so that it is fully charged before departure but doesn't sit for a week at a time fully charged. This is under the assumption that the more time the battery is full, the higher the wear.

Might be more of an issue on Gen2/ELR with the smaller buffers (aprox 2Kw top/bottom) VS Gen1 with the larger buffers (approx 3Kw top/bottom)
 

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It is never really FULL

Twice a week is only average of 3-4 day not driving so not long term

AND it is over 95 -100 F weeks on end here in Texas so temp need to be considered.

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1. Delayed charging type settings can be set to as low as 1 hr a day which may help the battery from getting as full as the car software will let it go. But on some Volt years will make sure the 12 volt battery gets a charge.

2. The car will be plugged in giving any other things you model year Volt has to offer.

3. You still have the day 3 timer what shuts off the load on the 12 volt battery like onstar radio
not sure if delayed 1 hr a day charge will reset that or if the car need to see the FOB or have a restart.
 

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Might be more of an issue on Gen2/ELR with the smaller buffers (aprox 2Kw top/bottom) VS Gen1 with the larger buffers (approx 3Kw top/bottom)
Correct. Gen1 has a very healthy buffer. "Full" is quite far from full. I wouldn't be concerned about sitting full all week at all.
 

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Ours is generally driven once a week or less - We have 2 other BEV's which serve 90% or more of our transportation needs. They are easier to get into and out of, easier to park and can haul more 'stuff' in the back with the seats up or down, plus we're not parking a $40k car next to a junker at WalMart asking for someone to door ding it

We pretty much do as you suggested - Leave the Volt sit all week with whatever charge is left from the last use and recharge the night before we will be using it again. Probably not necessary to do it this way, but for sure it can't hurt anything, so why not?

Don
 

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as long as it is plugged in you should not worry, the battery temperature maintenance system will keep the battery temperature below a level where high temperatures would affect a full battery. Sure if you are going away for an extended period, you could leave it sit unplugged and at lower charge.
 
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