clock/radio

[MrRed]

I have a 1990 integra with the dashclock and original cd player, and am fm cassete player setup.

my problem is, everytime i turn the car on, they forget time, and presets, theres obviously a problem with the electrical system, could this be caused by an old batery? i need to change it anyways so if it is or isnt the problem i might as well get it all checked at once.

help please and thanks