The fuse box.
No the battery is built in but should last a long time.
Normally it will last the life of the engine and is replaced when the engine is overhauled.
nissan micra has timing chain or cam chain and should be replaced at 200.000k
Batteries should be replaced about every 3 to 5 years, some can even last seven. However, it is obvious that if the battery dies (with no ability to "jump"), is corroted, or gets a dead cell in it then it should be replaced.
The computer only resets when the battery is removed. The alternator just charges the battery, so if the battery is left connected when the alternator is replaced, the computer should not reset.
Even though you have already replaced the thermostat, there are other issues that can cause your Nissan Maxima to overheat. Your fan may be stuck and not operating as it should.
clean the battery terminals that should fix it
You should check the battery,transmission, and maybe the engine
Did you reset the Check Engine light? If not, reset by disconnecting the negative battery cable for a couple of minutes. This will erase the computer. Reconnect the battery cable and if everything is OK, the Check Engine light should be off.
Replace it when it will no longer take or hold a charge.
in the fuel tank. should never need to be replaced.
If your security sensor in your 2001 Nissan Sentra 2.0 is jarred or jammed you should have it replaced.