I tried to get this answer over in the DJI forums and got nothing. Will try here... Can anyone give me the approximate charge time for the 57w advanced supply, the 100w pro supply and 4 pack charger? Does the 4 battery charger (from DJI) charge at a consistent rate or based on how many cells you throw on it (ie, 1 really fast or 4 really slow)? And how does it compare to either of the single chargers? I ordered an advanced with a 4 pack charger and an extra battery. So I will have the 57w and the 4 pack charger. I am wanting to know whether its initially faster to drop both batteries on the 4 pack or one on the 57 and one on the 4 cell. Also, whats the break even point here if anyone can tell me? Given these two chargers, how many batteries do I need to ultimately fly unlimited time (meaning I can charge batteries faster than I can use them)?