We dont really have the time or space to do that, so we are trying something else first, according to the instructions for the syrens, if the Nimh or nicd battery's are depleted or can't supply the current the controller would blink like it is doing, so we are going to try it with the lead acid out bruiser and see if that is the problem (I wouldn't be surprised as there cheap eBay ones with insurfisient wiring, and one cell on the spare battery was already broken, so we gonna tey the lead acid.