Is it okay to charge your phone at 40?
Modern Lithium-Ion batteries used in cell phones contain a chip that is used to control charging of the battery. It also monitors the temperature of the battery to prevent overheating under normal conditions. Recharging at 40% is a great threshold for Lithium-Ion batteries.
Should I only charge to 80?
A good rule of thumb seems to be to never charge your phone up to more than 80 percent of capacity. Some research shows that after 80 percent, your charger must hold your battery at a constant high voltage to get to 100 percent, and this constant voltage does the most damage.
What does 80% charging capacity mean?
Batteries have a finite amount of times they can be recharged and the more times you charge them, the faster they will wear out over time. This means you are conserving battery life most days, by staying within the 80% limit, but the full capacity is there when you need it.
Should I let my phone battery die before charging the first time?
It’s not necessary, instead the catalog books of most of the phones suggest to charge the phone completely before using it for the first time. But it is true that on a general basis you should let the battery discharge completely before charging it again.