I have this C100 phone which shows that it charges but when you remove the charger, the battery is still empty. Meaning it charges but does not store the charge
first u have to test ur battery in good condition... first measure w/ voltmeter.. a good battery voltage btwn 3.7-4V... if u need it, u can 'shock' ur battery with power supply.. 5-6V ( 3Ampere power supply minimal)
after that,try to re-charge your shocked battery normally w/ ur handset... enter code *#0228# for controlling your battery voltage while it charges.. its '3,5V-4.1 V' for normal voltage..
2nd way... make sure u've discharge ur battery... then charge it w/ pressing the code above..for good battery, the voltage was ascending for a bit time from 3,x to full state.. when u found ur battery in empty condition then u charge it and displaying full state or max volatge ( i.e 4V).. probably u have to change your battery... OR... its bad charger IC on ur C100..replace it (the IC indicate w/ LTH7 code )
i'm sorry 4 my bad english
br,