I don't know about other places, but here (in the UK), it's largely academic about being able to charge at more than 1C, for the typical 5000-odd mAH 10s f3a pack-the limiting factor is not so much the charger,but the regulated power supply-using the Cellpro charger at 1C, the power supply(rated at 20 amps) is usually running at around 20-21 amps for most of the charge.....