I have several questions regarding battery life and syncing. I am concerned about this because one time Gmail used 91% of the battery life and I had to tinker with the settings to fix that (I don't remember what I did but I was sure to turn off autosync. Maybe I had to autosync less data)?
1. What is the difference between push, pull, and auto sync?
2. Does one of them constantly check if there is new mail, thus constantly draining unnecessary battery life? Does one of them only sync when an email arrives, thus efficiently uses battery life?
3. Is schedule sync battery efficient?
Basically, I looking to preserve battery life but also want an update on emails. I read somewhere that your phone is always sending a signal, regardless of whether autosync is on or not, and that it uses battery in that regard. Therefore, turning off autosync doesn't really save battery life (I'm pretty sure this is wrong). For syncing, I use Google Drive, FileSync, Gmail, Pocket, Google Keep, Twitter, Facebook, and Reddit.