Hello,
You are going to find a heck of a lot of Chargers out there.
There are single charge port to multiple ports. The main thing in choosing a charger is make sure it will charge different types or chemistries of LiIon batteries.
Lithium ion, lithium poly ect.
As I suggested before, go to your local RC hobby shop or if you want to get one via mail order, HorizonHobbies.com.
The one I have, actually one of many, will charge different Li-ion chemistries, but also, SLA, ni-cad and metal hydride type batteries. Single to multiple cells, two charge ports and balanced or un- balanced. It will charge, discharge and cycle batteries.
Hope this helps,
Tom KC7BJE?
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Clyde Lambert