It's "flat battery" Tuesday.

The day roadside assistance companies get more callouts to jump-start cars than any other day of the year.

Figures released by Allianz Global Assistance Ireland show a 30% increase in call-outs on the first day back to work at the same time last January.

Managing Director Roland Hesse says it's actually very simple for motorists to avoid the post-Christmas nightmare of your car not starting: