If you are going to an on board regulator from a PB or CB... and need to bury the batteries, to me its a No Brainer..LiONs..

put some Fromeco Lithium Ion 5200 packs in the nose.. they are almost the same weight as the A123 pack.. you can charge them at 1C in the jet.. Have done it for years.. Thats my preferred setup with a regulator. High capacity, good Impedence. easy peasy to charge..

Call them and tell them what config and how long of wire and what plug.. I usually get them in a 2x2 long stick with 12 inches and a Deans.

No balancing required.


IFyou are not using regulators, then A123's or recently I started using BUDDY RC Life Packs.. you must balance charge A123/Life every time however.. If you balance charge and check them every time, you will be fine.. I did a lot and I mean a lot of testing on A123's back in the day.. they are insidious about getting out of balance due to the flat discharge curve..

Bottom line go with something you understand and are comfortable with..