This at least works for me, and pretty much anyone. This is of course written about HTC phones.
This assumes that the battery and everything is in good working order. If you do this: and you still have rubbish battery life, might mean that you’ve got some kind of hardware problem.
- Never drain battery on purpose. As that might damage the battery in the long run.
- With a new phone 1: don’t expect full battery life from the start. Will take a while for the battery to get conditioned.
- With a new phone 2: let battery fall to around 10% left until you charge the phone the first couple of weeks. But, do NOT drain battery until phone dies on a regular basis as that can be bad.
- Charge as you need.
- User Power Saver and/or Extreme Power Saver (on some HTC phones). At least know what it is, and where you set it.
- Avoid using Antivirus apps and any such apps. You are safe as long as you only install apps from play store.
- Battery saving app can use MORE battery. Don’t.
- Always known what apps you’ve got installed. Limit your apps a bit. I do app culls at times. Install apps only from Play store to avoid bad things as well.
- Wipe the cache partition ever now and then.
- Do a factory reset around larger upgrades (new sense/android). You have more about that HERE
- Know that mobile data can suck your battery dry in some places. Yes, sometimes you sit between towers making it switching between two (or more) towers.
- Be nice to your phone. Clean it a bit every now and then. Don’t let it sit out in the sun, since that might damage things.
Just updated your One M8 to Marshmallow?
Then you might need to read THIS.