Hello Tara,
Tommy's got a good point.
If that fails, and moving the battery is the only option, then I would be tempted to go to a trusted local garage who will have a simple device which links a slave battery into your system usually via. the cigarette lighter or similar point. The existing battery an then be removed and the surrounding area cleaned. No need to ensure you have the codes etc. if it's done this way.
Kind regards,
Gareth.