How to disconnect fiat battery terminals?

DD make sure you have the radio code to hand.  As far as I know you do not need to do anything else.  Is the battery not sealed for life?

Hi DD, what I did was to make up an adaptor ,use a cigarette lighter socket and length of cable with crocodile clips, plug it in to the cigar or aux socket and clipped them to the aux battery , take off the vehicle battery terminal and wrap them up (so they don't short) and remove the battery

you can buy a tool for this from Halfords etc ,but my way was cheaper !!!

P.S you might have to turn the ignition on if the socket is not live with ignition off

DD, when i had the problem with the flat cab battery (Pioneer head unit taking loads of current) i did do some battery 'level' checking which involved disconnecting the battery for a min or so (looking back, i could have removed the fuse from the SP circuit but.....) and this had no adverse effect on the radio of other instruments. i think the radio has an internal batrery as all stations remained tuned.

the battery negative has an 'easy release' clamp.

Just a suggestion. If you can access the top of the battery post perhaps a self tapper (usually a hole in the centre) to hold a length of wire fastened around a washer with a crocodile clip on the end to connect to live cable whilst you remove it? With a decent length of wire to give flexibility the clamp on the live should be able to be moved out of the way.

If its like ours that may be a bit awkward 

Apologies for being a stickler, but the earth (negative) terminal should always be removed first. If you go straight for the positive and the tool you are using and/or your wedding ring will happily complete a circuit should you slip or accidentally touch any of the surrounding metalwork.

If that happens a big fat 400 amps spark, maybe a badly burnt finger or hand, maybe a surge sufficient to damage the vehicles electronics, or worst case scenario.............particularly if battery recently on charge (ie vehicle being driven) that big spark could cause battery to explode leaving you with life changing injuries.

For the same reasons the idea of using a wire to jerry rig the feed is also unadvisable.

Never like to pour cold water in these forums but I have seen the results of someone failing to respect the enormous amount of stored energy in automotive batteries. Negative first Always.

I recently had a new battery fitted by the dealer during service and the only thing it needed was for me to tell Tracker company that all was OK when the tracking device went off due to a break in the supply and they called me . My radio is a JVC I think and it has no code that I am aware of. It worked perfectly fine afterwards.

First of all check if you have a live ciggy lighter socket even with the keys removed. if so just buy one of : These  obviously don't try and switch anything on when in use