[Niubee]

if I go out I got bring battery pack in my bag so I think back is ok.

I think why people get new phone sometimes feel phone is old so just buy new phone instead change battery.

I can see easily u have cheapskate mindset. Cheapskate people tend to live principle life but hard life. Not flexible. Make money to make your life convenient. This cheapskate mindset will pervade every aspect of your life. Get out of your comfort zone...