From reading on here, I was expecting to have to remove the battery case lid to accommodate the bigger battery, however, I've noticed a couple of wires attached to the case lid. From inexperience, I'm not sure if this is the norm of if its something to do with the alarm. If i was to hazard a guess, it would be that its some sort of detector for when the seat is removed when the alarm is activated?
Some pics to help
Battery

Bit attached to battery case

Alternate angle

From the inside of the case lid

So my question is - if i remove the lid to fit the new battery - if this bit is what i think it is, is the alarm screwed? Would i need to disconnect the whole thing? Any workarounds?
Any insight appreciated