For how long should I charge my Nokia N97 mini for the first time?

Tree

Member
The shopkeeper told me not to charge the battery until the battery is off, and after that I should charge it for 9 hours. After 3 hours it was fully charged, should I continue? I hear if I keep my phone plugged when it's fully charged, the battery life becomes shorter.
Does anyone have the same model? Please let me know if you can help. :)
 
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