Like all batteries, lithium-ion cells age and degrade over time and with use. To prolong battery life and performance, try keeping the battery level between 20% and 80% several times a week instead of using the device for a short time and then plugging it in to recharge the battery. If your device supports smart charging, turn it on to make sure your device stays charged to the recommended battery level, even if you keep your device plugged in.
When using the battery, it is advisable to avoid certain conditions because they can cause the battery to deteriorate and age at a faster rate:
Try not to use your device or charge it in high temperatures. Extremely high temperatures can cause lithium-ion batteries to deteriorate at an accelerated rate, which can permanently reduce battery capacity.
Store the device with the battery charged below 50% but not completely discharged. More charged and then stored batteries may lose capacity faster. If you need to store your device for a long time, you’d better make sure the battery level is below 50% but not completely drained before storing your device.
When a battery is badly degraded, the life of the battery may be very short or the Li-ion cells may expand. When a battery expands due to deterioration, it is most often caused by the formation of non-flammable carbon dioxide (CO2) gas. If the battery in your device has visibly expanded beyond the mechanical housing, you should stop using your device. It is advisable to handle the device with caution to avoid putting pressure on or puncturing the battery cell.