So I think the battery on the polo is on its way out. The car would not start yesterday morning. Push started it and drove to work (14km's). Went down to the car about 2 hours later and checked it started first time. Went out at lunch and drove about 8km's before parking off again until the afternoon. Car started and drove the 14km back to home.
Last night I had to move the car out the garage at about 20:00 and she would not start. Push started again this morning and she ran to work fine.
Is there a way to 'save' the battery before replacing it (i.e. place on trickle charge overnight?)
If I am to replace it, which brand would you recommend and are there any to stay away from?
Also, do I go with something with more cranking power given that I am running the ADY in the polo (and I have some sound in the car if that makes a difference).
Any advice would be welcomes as I am admittedly quite dof when it comes to batteries.

Thanks in advance.