Minimize power consumption of LED flashing

[JohnBrown]

I have a "heartbeat" LED which flashes for 10mS every 2 seconds. I was doing this with one of the HW timers and a PPI channel, but I have discovered that just having the HW timer running seems to add around 4mA to the power budget(which I guess is not surprising). Can anyone suggest an alternative way to do this? Could I, perhaps, use an app_timer, but in one-shot mode, and reconfigure/restart it in the expiry event handler?

[Locky]

For an application like this I use two app_timers. One repeated timer set for 2 second cycling, and a One-Shot timer which is set to 10msec. When you hit the Repeated timer handler:

1. Turn on the LED
2. Start a 10msec one-shot-timer

Have the One-shot handler turn off the LED.

[JohnBrown]

Thanks. Why would that be better than using the same timer but alternating the period each time?