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Actual battery SOC vs. available SOC ranges

7779 Views 5 Replies 5 Participants Last post by  Sean_R
My understanding is that the Volt's battery is never fully charged to 100% or discharged to 0%, but is kept in a range of state of charge in-between.

Has anyone determined what the state of charge (SOC) range is that the onboard charging system maintains as hard minimums and maximums, and how this corresponds to the displayed charge level on the driver's display panel?

On a related note, I've read elsewhere on this forum that maintaining a SOC on the battery centered around the 50% level, with small deviation from this level, will significantly prolong battery life due to not fully exercising the limited number of charge cycles. I'm wondering if a charging strategy of keeping the SOC between 45 and 55% would accomplish extending the battery life.

While reviewing specs on the earlier Gen 1 Volts, the 2015 Volt, and now the newest Gen 2 model, the battery capacity has only increased a small amount (<10%), yet the Gen 2 models jumped in EV-only range from 35 to 53 miles (50%). Aerodynamics aside, this might imply that GM has opened up the available amount of capacity on the battery for driving use, while eating into the cycle life of the battery.

If this is so, perhaps it's because GM's had 5 years of history with Gen. 1 battery life to get more comfortable with meeting the battery life warranty requirements. But this claimed increased range might then come at a reduction in battery life, of which customers would be unaware. There would be nothing wrong with this per se, but it would be nice to know the approaches that owners could take to keep the battery best-cared for to promote maximum longevity. Any thoughts on this?
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I don't know the details, but I frequently find myself wishing I could dial 2 more kWH out of the battery to cover my commute in bad weather <sigh>. Being SO CLOSE to work or home and having the REX kick in for the last 1-3 miles annoys me far more than I expected. (laughing at myself for my first world problems)
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