The red light flashing when charging is caused by excessive battery discharge, the mobile phone itself needs a certain amount of time to adjust the battery voltage to a normal degree, at this time you can use the original charger or the mobile power with large current to solve the problem, the mobile phone will return to normal when charging the red light.
How to prevent battery self-discharge:
Do not often use after discharge, charge in time. Overcharging the battery is not good for the battery, but it is also harmful if it is overdischarged and recharged. If the user often overdischarge, and still insist on using it after discharge, it will also cause great harm to the battery for a long time.
Charging avoid too high and too low temperatures. Battery requirements for hot and cold is not high, as long as the normal temperature on the line, too high easy to lead to battery temperature rise, damage battery performance, too low is easy to reduce activity, and then lead to poor battery acceptance, charge and discharge times, indirectly shorten the service life of electric vehicle battery.
Finally, for the long-term shelved battery, it is recommended not to use immediately, it is best to be fully charged before use, so that the battery can be protected from damage.