Problem starting on frosty mornings?

[chunk166]

Ok, this has happened 3 times now! On cold,frosty mornings my bike will not turn over & all the clock readings go back to zero except the mileage!, It's like the battery is knackered? but if i bump start it & run it for 5 mins,turn it off & leave it for 10 mins it will start like its ok?
Have you Guy 'n' Girls got any suggestions,should i just buy a new battery as i've not seen this happen on other bikes??


Cheers


Ray