- Is this the right charger for my LiPo battery?
Yes that charger will work for your pack. The Thunder AC6 will charge 1 to 6 cells of LiPo's and 1 to 15 cells of NiCd/NiMH. The LiPo you listed is a 4 cell pack.
- Using a Ni-cd/MH battery charger on a Li-Ion battery pack?
Your Li-Ions will be toast if you don't use an Li-Ion charger. Unless it's for charging all batteries including Li-Ion it will permantly damage the Li-Ion battery.
- Can you charge rechargeable Ni-Mh batteries in a Ni-Cd battery charger?
It depends. If you have a fast charger, no. The batteries have different electrical properties and the fast charger may not turn off at the correct time, over-charging and damaging the battery. There are fast chargers that are called "dual chemistry" or "smart charger". These types of chargers will charger either battery. Most slow chargers will charge either type of battery with no problem.