I have been using a 1500 mah battery in a jet for the passed two and half years with no problems. And this year I have been getting failsafe mode on my 9z Futaba, I replace the battery and still the same result. I have 7 servo, two that are digital, a jetcat brake valve and I have a P80. The battery is been drained some how, I test all servos and the test OK. Any suggestion are welcome?