Speaking of batteries, in general, though, one must keep in mind that the "kit" battery cables can become unsoldered, or just twisted lightly and cut from the battery. Also, on the plug side, it can become "hazardous", because the battery cables were quite hard.
Then, it's a very difficult process to fix the plug cable back on the battery, without shorting it..
I had this problem with the preproduction kit I was given, back in April:
A few more pics from the preproduction bike here:
Same thing with the plug that is mounted on the bike. However, on my production bike, now, the plug is reinforced, and not like the one shown in the pics, in the above link.