2x 5200mAh Jeti Li-Ions in both my jets. Both feed into the CB200/ CB400 for redundancy, plus a split off from one battery to also run the ECU. Starting the turbine is the limiting factor and I can get 4-5 flights before I need to charge. If I can start the engine, I have plenty of battery to fly.
They hold charge for months. Charge them as LiPo even though they are Li-Ion due to the charge protection.
Paul