I appreciate a lot of people dont use them/hate them, but for anyone who does know, Im trying to charge mine and having issues. At the moment the light on the charger is going from red to green every few seconds, is this right? previously it was just staying green as if fully charged, which it certainly wasnt. I opened it up and a red wire was loose so I soldered it back onto the red live terminal, thought that would be it. I use it a lot for odd jobs so need it for tomorrow really. Just wondered as im sure it used to stay red for hours and warm up until it was done. Anyone else had this where it goes red to green every 5 seconds? I