Thanks for all your comments/replies foccers
...looks like i have just been unlucky, last time out on the bike i got caught in heavy rain, had about an hours ride home and it didn`t stop, waterproofs were useless soaked to the skin by the time i got in,put the bike away wet and left it for 3/4 days before i discovered the dead battery, had to move the bike this morning as i needed the garage space for another project, jumped the bike and it started easy as it always dose but the clocks were playing games, normal one minute and then nothing,rev, speed, clock, miles all blank, bike runs fine whilst this is going on so guess the rain has got into a connector or two...
will be ordering a Yuasa shortly, had one one the 600 which lasted about 19 years, replaced with the same and has been fine,
GNASHER thanks for the link for TAYNA. That looks like a bargain to me. I paid £75 for the motobatt 2 years ago