Clio won't start - do I need a new battery?

My Renault Clio (2009) will not start. It will jump-start with cables, though, but does not retain its charge. It is absolutely dead, so much so that I am unable to lock the doors electronically with the key. Do I need a new battery?

Asked on 17 December 2014 by Reevo Anders

Answered by Honest John
This reads as if you do need a new battery.
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