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The battery on my car has run down even though it's just been parked up - what's the cause?

The battery on my Opel Omega has run down even though it's just been parked up. What's the cause?

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How old is the battery? It's either worn out and needs replacing or you have a 'leak' - a live feed from something that's staying on that's draining the battery after you've turned the ignition off. If you don't have a way of testing the battery's health, your local auto electrician may be able to give it a health check.
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