By the way you shouldn't have done empty your battery the first time.
Why ? Because now in our smartphones we have Lithium-Ion battery instead of lead battery so what you did was a good thing ... but for the lead one. When you have a new laptop or smartphone it is already charged up to 40% because if it's below with the natural capacity loss of your battery you could damage the internal circuit and if it is full charged it will be as harmful as if it's not enough charged.
If you empty your battery the first time before using it you can lost 20-25% of its capacity in just one cycle
So when you have a new smartphone or laptop or anything else with a Litium battery :
- Full charge it before using it
- Discharge it until the warning message "Plug your phone ..."
- Full charge it again
And never empty your battery, keep in mind that there is a complex circuit system which always need electricity.
These informations are from a very very good pdf i read few months ago about Lithium-Ion batteries. Unfortunately it's full french but if someone is interested I can send him a PM with the link