Are my car batteries dead?

[RC1]

just checked both batteries for an e36 and e46 and one is showing 11.6 and the other 11.9 with a voltmeter...ive read that healthy batteries are about 12.4-12.6 nominal voltage?

is it time to replace? no issues with the electrics and all works as it should although the 11.9 one which is in the e46 seems to have a laboured warm start but perhaps not battery related