Here is a very good 3s batt....
http://www.amainhobbies.com/product_...d/25014....The only thing that bothers me a lilttle is the 16c rating on the batt...You generally want a batt. to have at least a 20C rating....However, the cells in this particular battery are Enerland cells which are the best cells for holding their voltage under load.
Any PolyQuest or Enerland cell batts. are excellent choices.
Hope this helps.
As far as a charger goes...I have a EOS 12 Hyperion charger and really like it. Many forum members have Hyperion chargers and like them. My suggestion is by a bigger charger than you think you need, because you
WILL need it sooner than later.
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S