In a company of S5, Note 3 and iPhone 5S, I have no choice but to hit the home button for my apps coz anytime they will use their phones to compete with mine. If mine is a tad slower they will say Samsung is better coz its so much quicker when the app is launched. So GP2 is still holding its ground.
I don't really close my apps. I always hit the home button. So far no lag yet. I also dunno why need to clear Ram. If its during the S1 days , most probably but now, I have 20 apps in my task manager and none of them lags. Play game also no lag. Battery power aiyah ... negligible lah. I got one spare battery in my bag, no scared. If really eat a lot of battery power then buy another battery loh. The battery also don't really cost a lot. When I was still using my Note 3, I had 3 spare batteries in my bag and one battery lasted me 3.5 days with 20 apps in the task manager.
I don't believe having 20 apps in my task manager and my battery life will be shortened like half a day ? No way !~