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Great subject and from what Ive read I am convinced no one really knows the correct answer, however there are plenty of examples that damage and shorten pack life.
Ok, first off we need to communicate if we are talking about % of charge of the pack itself or what the car uses which is typically less like 80%.
For example in the gen 2 insight I see 3 voltages, the car considered 112 to be 90% to full at times, 117 is FULL according to the SOC meter 121 is considered full and balanced hot off the charger.
I am guessing you are saying precharge the pack in this example to 112-117 volts or somewhere in the middle like 115 volts? Yeah, I can see that being some benefit and likely ok as long as its monitored. You could stack a few meanwell power supplies and fully charge the insight pack in 3-5 hours depending on its current soc.
Now if the car has lifepo4 or some form of lithium cells those go up fast in voltage when a cell is fully charged vs the rest, so if you are charging the pack you need to make sure it has some type of active bms and that system is fully operational if you are going to tap a few electrodes and back feed power to it like the Honda and prius guys do.
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