ButterTime

It is really not worth the worry to be concerned about how to use lithium batteries. There are a lot of myths going around, some more true than others, but none of them will make your battery last significantly longer . Batteries are consumables and they wear whenever you use your phone. You should avoid leaving your phone in very hot or cold places, but that's pretty much it.

You can run something like geekbench to check if your CPU benchmark scores are significantly lower than a new phone of your model. My friend has just recovered 50% performance from a battery replacement.