1. Take old one out, put new one in.
2. Plug it in and turn on.
3. Leave it till it hits 100%
I would suggest that you d/l and use Battery Care. Over the years, battery technology has changed and you will see posts ranging from ...."never let it get too low" and "best wait till low before recharging". All outta date. Best to avoid going below 20-30% too often. Most questions about battery care and usage can be answered the same way :
Yes .... and No.
Should I remove the battery when A/C is plugged in ? .... YES and NO, it depends on the situation.
Should I let the battery get below 20% ? .... YES and NO, it depends on the situation.
You an safely recharge the battery at any time..... however, once every 30 charge cycles, you should let today's batteries run down to nothing, followed by a full charge. The reason is that the battery charging circuit applies varying voltage. In the beginning the voltage is higher, and it tapers off as the battery gets closer to a full charge to keep it from overheating. Each time you do a complete cycle, the battery monitoring system recalibrates what constitutes a full charge. If you don't recalibrate, the charging circuit will over volt the charging applying the higher voltage for longer than it should cause it still thinks it's not fully charged when it is.
OTOH, if you were to recalibrate with a full discharge / recharge every day .... then you would also wear the battery out. The optimal calibration interval is about 30 full charging cycles..... so if say on average you use half your battery life every day, the optimal interval between full discharge / recharge for calibration purposes is 30 cycles / 50% drain = 60 days. Again BatteryCare takes all the worry out of this equation.
http/batterycare.net/en/index.html