I upgraded to the P4 last year and overall it's been amazing compared to the P3. But I have noticed the the P4 controller doesn't hold it's battery charge nearly as well. I would do a heap of flights before the P3 controller LED's ever started to blink. But after one flight on a full charge the P4 will be down some already and displaying it on the LEDs. It's very manageable... I was just curious to see if anyone else had noticed something like that too.