I almost ordered a 1300mAh as well. Yes, it is eye-wateringly expensive, but I was rather disappointed with the Zippy Flightmax 4200: it doesn’t hold its peak voltage at all and falls back to 13.8v almost immediately without any load at all. So, for me it’s a choice between a battery that is twice as big and heavy as I need without the stated capacity, or one that is twice as expensive. If the quality is high I’ll call it a draw.
73 de OE6FEG
Matt