It would be "best" to acquire both pieces due to the fact that nicads AND nimh cells should be stored (after flying) in a dis-charged state.
This is so the crystalline structure of the cells doesn't harden(limit the charge for next time out also called cell loading).
If the cells are cycled (if the cells are NOT taking a full charge)the hardened crystalline will begin to soften again and open the potential for a more complete charge.
The Sirius pieces are some quality product!!!!!!!!
If you are seeking a GREAT charger that does "both" in one unit,
check out the Schulze isl6-330.
Its around 169.99
Another QUALITY product!!!!!!!
