We'll I can't see it making any difference on my device. In 90 mins of my phone being on standby whilst playing football tonight it lost like 17% in LPM also when using the device within minutes it lost 3... 21-18% This is the exact reason I switch of the percentage to stop worrying . Now I'm wondering perhaps LPM comes into full effect below 20% so putting it on sooner does little to nothing?..