Here are the details. Lanier Yak 54 with a 3W75i Six Hitec 645mg, four on the wing, one for each elevator One Hitec giant scale (can not remember the model it's the larger three bearing output shaft servo) JR 507 throttle servo JR 945s PCM receiver 72MHz JR HD switch harness Voltmagic A123 2500mah battery I flew this set up several times. The Voltmagic never did log any peak low voltage detection. I switched to a JR 921 2.4 receiver and now the Voltmagic logged severe low peak voltage. I upgraded the switch to a H3C input and a three wire balance tap and dual output to the receiver. No more low voltage detection. So my question is why did the system work with the 72 MHz without any low voltage detection? Does the 2.4 receiver drive the servos harder? Thanks.