Modern batteries are virtually maintenance free,so unless you have a specific reason for opening the cells,I would leave it alone.If you are worried about the type of battery fitted,then buy yourself a genuine Vauxhall battery which is totally sealed for life.Not as expensive as you may think and certainly cheaper than Halfords.I think the smallest type now made for this model is 50ah.It is not necessary to reset the radio code on these late model corsa as the code is held in the vehicle electronics.hth
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