A Battery has 2 specs you need to consider
A/H (Amp/Hour) CCA (Cold Cranking Amps)
A diesel tends to have a higher CCA , but similar A/H to a petrol version. You need higher Amp/Hours if you are fully loading the alternator circuit.
You standard battery is usually around 50 A/H and 470 CCA
Try a heavy duty version such as this on ebay with a 62 A/H and 570 CCA
http://cgi.ebay.co.uk/Heavy-Duty-Battery-Citroen-C1-C2-C3-Diesel-2001-on_W0QQitemZ280448636025QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item414c0a9479
But also check your alternator usage , if the new sound system takes a big load it could be over loading the alternator.
Many years ago I fitted a bass box system to a car which had a heavy duty electronic ignition system and High power KC day lighter spot lights . If I put the spot lights on with the sound system on high the engine cut out!! LOL!!
had to fit a heavy duty alternator to make it all work together.
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