[brian_]

in which case what i'm looking out for is a bms which can handshake with the ccs protocol at public charging stations, and a battery which can take that kind of rapid charging (which i think the Volt batteries can, given sufficient cooling)

Since the handshake includes the EV telling the charging station what rate is allowed, any battery can handle a rapid charging rate... it's just a question of exactly how rapid. You don't have to accept the highest possible rate that the station can handle.

On the other hand, if the station charges by time rather than by energy, you want to charge at the highest power that your battery can safely handle in order to get as much energy as you can for your money.

 

[brian_]

Chademo is losing ground to CCS, Nissan just accelerated that

I had not heard this news yet, but it is interesting:
InsideEVs: Nissan Transitions To CCS For US And Europe, Dealing CHAdeMO A Fatal Blow
Green Car Reports: Nissan's move to CCS fast charging makes CHAdeMO a legacy standard

The shift does add incentive to work with CCS for long-term usability.