Do you really need to hook up a battery charger to install cobb accessport? How many did or did not?
Cobb only says this as a precautionary thing.
If your battery is fully charged and in good shape there should be no problem.
The only problem would be if your battery failed in the middle of a re-flash, all files could be lost.
This would mean that your car may not start and you may need to have it towed to a dealer to re-flash the PCM.
That would be if you told them the truth about what you were doing.
If you told them that you did not know and the car just didn't start, they may want to replace the PCM.
If the dealer then sends the PCM in for analyses, this could cost you a bunch.
Dave