SOC is somewhat subjective. One way to guesstimate it is by voltage. For the gen 2 109 volts is like 90% 117 is 100% according to the cars SOC meter. Full balance is like 122 volts. So you set the charger to 109 so it stops at that point.
The problem is when you pass that. Granted 122 is absolutely full, the car never reaches that as it only uses x % of the battery. This is why when guys go a maintenance charge it wont register properly til it does a recal.
Plan B is to never fill up the battery or let it do a recal.
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