How Li-Ion charging works:

How Li-Ion charging works:
1. If you plug in the phone charger when the
phone's charge is a low percentage value, the phone
commences Fast charge. Fast charge means the
phone will quickly charge to 80% of battery.
2. Once the phone has charged till 80%, trickle
charge begins. Trickle charge provides very less
current. You may have noticed that charging slows
down post 80%, and charging from 90 to 100 seems
like forever. It is because the battery enters trickle
charge. This avoids overcharging and degradation of
battery life.
3. Every battery has a number of charge cycles after
which it will never hold 100% of capacity. This
usually happens after 300 to 500 charge cycles.
Some people may notice their phone never charges
above 80%. If that's the case, replace the battery
soon.
4. We usually leave the battery to charge overnight,
but that's a really bad habit and literally destroys the
battery in long run.
Consider a human, if you feed him with more food
than he can take, he'll surely get sick. The same
way, batteries get damaged when you provide more
charge than they can accommodate.