You can charge the BlackZon battery packs (Li-ion 7.4V, 800mAh) with the SkyRC T100 charger as it supports Li-ion batteries. However, you will need a suitable charging cable as the charger uses XT60 plugs. An adapter from Deans to XT60 would be necessary to connect the batteries safely.
If the battery is fully charged and you want to store the battery for a longer period of time, then there is the "Store" function. In this case, the charger should be able to lower the battery to the "storage level". Discharging the battery completely does not seem to work and does not really make sense.
The charger charges LiPo, LiFe, LiIon and LiHV batteries with a cell count of 2 to 4 cells (2s to 4s). The voltage is typically in the range of approx. 7.4 V to 14.8 V, as a LiPo cell has a nominal voltage of approx. 3.7 V. For NiMH and NiCd batteries, 6 to 8 cells are possible, and for lead batteries (Pb) a voltage of 6 V to 12 V. The charger therefore supports a voltage range of around 6 V to 12 V for Pb batteries and correspondingly for the other types depending on the number of cells.