How sure are you that the batetry needs to be replaced. Lots of things can result in a fully discharged battery that simply needs to be recharged.
If the alternator has failed, for instance, you may find yourself out the cost of a new battery for no good reason.
The best thing to do is to restart the vehicle via jumper cables and then see if the charging system will recharge the battery.
And by the way its SPRINGTIME!
This is the most common time of year for corroded or slightly loose battery terminals to "show" themselves.
I would remove the battery connections, clean and burnish the battery posts and connections, reconnect, and then see if the battery and charging system works correctly.
I reconnected the battery without success.
I was ble to get a brand new one from NTB and the engine started immedately! Called my brother and he mentioned he does not remember the last time he changed the battery.. and it has been 4 years since i bought the car from him.