Study the high voltage circuit from the charger plug to the battery +/- leads. I think you'll discover that voltage from the charger goes from the charge port to the black box nearest the port. I believe this is the Battery Control Unit. From there it goes to the Inverter and finally to the battery leads. The BCU probably controls the switching mosfets for charging/discharging (not to be confused with motor control switching/modulation) located in the inverter and monitors the amount of energy going into and out of the pack for SOC calculations.
If you have direct access to the packs +/- terminals you theoretically could charge it with the supply you mentioned, but it better be a smart charger made for L-ion cells for safety. Obviously, the pack won't be near balanced but if the goal is to just get everything about 2.5v or so it'll probably work.
Also note, the stock charger probably has a relay at the output (mine does). You might be able to jumper closed the relay and get it to at least provide the voltage you are looking for. Probably still wont charge through the port however, but you never know.
If you have direct access to the packs +/- terminals you theoretically could charge it with the supply you mentioned, but it better be a smart charger made for L-ion cells for safety. Obviously, the pack won't be near balanced but if the goal is to just get everything about 2.5v or so it'll probably work.
Also note, the stock charger probably has a relay at the output (mine does). You might be able to jumper closed the relay and get it to at least provide the voltage you are looking for. Probably still wont charge through the port however, but you never know.