ntp frequent time resets - battery dead?

[Anton Shterenlikht]

I see in /var/log/messages:

Mar  4 00:16:40 mech-anton240 ntpd[764]: time reset +0.291030 s
Mar  4 00:38:02 mech-anton240 ntpd[764]: time reset +0.344745 s
Mar  4 00:57:37 mech-anton240 ntpd[764]: time reset +0.338739 s
Mar  4 01:19:45 mech-anton240 ntpd[764]: time reset +0.355020 s
Mar  4 01:41:34 mech-anton240 ntpd[764]: time reset +0.365177 s
Mar  4 01:58:41 mech-anton240 ntpd[764]: time reset +0.306982 s

and so on.

The correction seems large to me.
Does this indicate that the battery is dead?

This is on a Sun Blade 1500 silver desktop,
about 10 years old.

Thanks

Anton