All batteries have an expiry date. Same is true for smartphones' batteries as well. However, the way you use your smartphone also goes a long way in deciding the longevity of your device's battery.
Here, charging habits as well as the chargers you use also play an important role.
Avoid cheap chargers from unknown manufacturers. They do not include any safety mechanisms to protect against fluctuation and over charging. Adapter failure could permanently damage the battery and phone.
It is recommended that you remove the phone's protective case while charging. It is natural for the battery to become slightly warm, but the case may act as a barrier and slow down heat dissipation. If possible, flip the phone over and place it on a soft cloth to protect the display.
Always using a fast charger might not be the best thing for your battery's health. This process involves a higher voltage to be sent to the phone's battery, which results in a rapid rise in temperature. Opt for a normal charging cycle, if your smartphone provides this option in its battery settings. Alternatively, switch to an approved matching regular charger.
Allow the battery to discharge to around 20% before you plug it in. Constant and unnecessary recharges shorten the lifespan of the battery . On the flip side, avoid allowing the battery to lose all power.
Avoid using your handset while it is connected to the powerbank. Using the device in this mode will increase the internal temperatures and shorten battery life.