The battery lead that is not the earthed lead should be removed first. If the negative lead goes to ground then first remove positive and vice versa.
This is true also for any non vehicular electrical device although the earthed lead is less easy to find but is almost always negative.
Remove earth lead first and fit last!
The battery, on a 2009 Dodge avenger, can be removed by first removing the battery cover. Remove the battery cables and the retaining rod. The battery can be lifted out.
The negative battery cable from the battery.
remove guy ropes
Positive lead
By removing the olds ones first
There's usually a bracket or clamp holding it in place that has to be removed first. After that, it's pretty much a matter of lifting. There's nothing highly technical about the process, and if you're mechanically inclined enough to make removing the battery yourself more than an exercise in futility, it should be obvious from looking at it how to do so.
Remove the ground or negative cable first when disconnecting your car battery.
Remove the negative cable first and when installing the new battery connect the negative last.
Disconnect the negative battery cable off of the battery and allow enough time for the capacitor to discharge before beginning to work on any supplemental restraint system. 10 minutes should do it.
Because if not, you could remove the SIM without shutting down the phone, which can make it stop working. I managed to remove the SIM from an older Sagem phone without removing the battery and the phone just blocked. I had to remove the battery insert the SIM and put the battery back in order to restart it.
Pop the hood. Disconnect the negative battery cable, then the positive battery cable. If you disconnect the positive first you could possibly ground out the battery with your wrench causing a short. Once those have been disconnected the car should have no power. There is a battery tie down on top of the battery that holds it in place. On one side of the battery tie down there is a bolt threaded on to a long rod that continues down to the bottom of the battery. I believe that bolt is either an 8mm or 10mm. Once that bolt has been removed the battery tie down bar can be removed and there is a black plastic box that sits around the battery and that should lift right up. Once those pieces have been removed the battery is free to be removed. Follow the same steps in reverse to install a new battery. The main thing is that when putting the cables onto the new battery put the positive on first then the negative.
Mine Canisters