Hi.  Nowhere can i find any specs on the lifespan of a fully charged controller.  How long do i have before a fully charged controller needs recharging? Thanks.

I guess I recharge the controller about once every 20 aircraft batteries, although I never let it get onto the last light.
However that is flying in UK where we use less power than in the USA.
It may also depend on how much power your phone/tablet draws from the USB.

It depends on the mobile/tablet you connected with RC. The maximum using time of RC is around 6 hours when it connected with mobile devices.

My new phantom 4 controller only last 1 battery until I have to plug them both in.....why ?