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2005 1.4 Battery charging. - Old Codger
Is it strictly necessary to remove battery terminal connectors before attaching a battery charger, or indeed not at all? In the old days with a dynamo it didn't matter. Nowadays with an alternator I'm not so sure. Recently I removed the leads and the radio worked fine with no attention afterwards.
2005 1.4 Battery charging. - Simon
The wise decision would be to disconnect the negtive terminal before charging the battery, that way you can't do any real damage. But generally speaking a normal diy style battery charger will be fine without needing to disconnect the battery. Just make sure evrything is switched off, charge it up and don't turn the ignition back on until you have removed the charger when you have finished.