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It's just possible the alternator is overcharging the battery and gassing it i .e. creating a lot of gas bubbles in it.
Try checking the voltage (if you have a meter) across the battery terminals when the engine is running - around 14volts is good, more than 15v is too much.
Also, test the battery voltage with the engine off when both hot & cold. 12.5v is good, 12v or less indicates battery in knackered.
Also check for corrosion in earth strap from battery to engine.
Currently in Hammer-ter's garage:
Scenic III 1.2 TCe 115 2012, Clio III 1.2 TCe 2011, Peugeot 207 1.6 HDI90 2009