[Batfish]

The SkyVolt packs are the same technology as the BalancePro packs, with more cells in series. The charger balances the cells during charging and can charge at up to 10A. You need a low-voltage cutoff device (ESC or external device) to protect against over-discharging for both.
Their charge protection module lets you use your own lipo charger to charge the SkyVolt (this is different from BalancePro, since BalancePro requires the BalancePro charger) as well as the SkyVolt-specific charger. The charge protection module will cut off the charge when any cell in the pack reaches 4.2v while charging.
Their discharge protection module is a low-voltage cutoff device made to work with the SkyVolt packs.

Unfortunately, you can't charge any of the 6400 or 9600 packs to 90% in 20 minutes due to the limits of the charger. You have to set the charger to 3C for the 20-minute claim, but it only goes to 10A. You'd need 19A and 28A (approx) for the larger capacity packs to charge in 20 minutes. Either way, it's still nice to charge my BalancePro 2s2p 6400 at 10A. :)

Lastly, the prices on FMA's website aren't suggested retail price; they are actual retail price when purchased from FMA Direct. For example, the 2s2p 6400 BalancePro packs I have cost $285.95 if purchased at FMA Direct, but cost only $199.99 if purchased at Tower. With this in mind, I don't know why anyone would purchase from FMA Direct, but it IS their actual retail price :)