Dear Friends,

First I am not good at batteries but I know recent lithum Polimer batteries are not yet sufficiently stable for power source. First mr friends say that it can draw around 4C maximum, whilst one of Korean Manufacturer is almost succeeding to improve it upto 10C and going to release in the market soon.

We had tested it in our turbine engine ECU and Starter. In case of J600 when starter revoles, the currency draw upto nearly 9-10 ampheres momentarily. But in a seconds, it goes down to 3-4 only when turbine running smoothly.

This means that when we use new battery technologe with Li-Pol is rather O.K. and quite reliable. I am going to use over 4,000ma Li-pol for my twin turbines.

However, if you are going to use it for RX with number of digital servos, I would strongly recommend to refrain. We tested high torque digital servos with checker and found tremendous draw of currency momentarily. For example, if you have tester, please try it. One servo used draw more 4-5,000ma if it is forced stopped by hands. If you imapgine with 6-7 digital servos and try high G-turn or quite sharp manuver, your battery volts will suddenly dropped below rx managable. and plane will be dead stick.

Mostly we here use still heavy Ni-cd with 12-13C capability of draw currency. It is sleep easy equipment still.

Meantime, I changed switch with toggle type (strong springs) instead of sliding one. We also make two leads from battery pack and two leads to rx, one for battery slot, the other for empty slot. We found sometimes, switch capacity is not enough to pass the battery capacity to RX and servo.

We have Kokam Brand which is really revolutionary technology for electric motor and planes. But due to reason above we refrain to use it for RX yet. But if it is not digital servo and not heavy plane I would think it is o.k.

Jai Young Shim