Share your experience!
Im concerned about my phones battery life, does using the phone while charging decrease battery life? Is the battery replaceable if it drains quickly in the future?
i think you mean - you just want to follow good practice to keep it going longer isnt it.
one thing i do is - not leaving it attached to charger all night, to avoid reaching 100% and still getting charged.
Z1 manual may have more tips.
It won't but your phone seems to be acting up as it is, so you have to get it inspected by your Local support
you can't overcharge a phone, once the phone reaches 100% it will stop charging.