"mike" wrote in message
news:d7FTj.1442$Ve.1035@trnddc08...
wrote:
Can I use 2 alkaline batteries (3V) in parallel with a (non-
rechargable) lithium cell (3V) as a back up without problem?

Thanks
Short answer is NO!
Since you give ZERO clues as to what size batteries, or what voltages
your unspecificied system can tolerate, or what
you consider a problem, you can't expect even an approximate answer.
But a careful person would still say, NO!
Take out the lithium cell.

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Or isolate it with a diode.