thanks to dave cutter and 2 old , the battery problem has been fixed . I pulled the bms off the top of the cell and when I turned it over ,,,the underside of the printed circuit had a burned 3mm foil track going to what I suspected to be the power supply . I took it to a guy I know who repairs guitar amps and he resoldered it . Its now back on the bike and going as it did before this happened . I also took it to a battery shop where they checked the cell and they told me it was unharmed by the fizzle on the BMS ,,,. All is good !
rick