For my '08 GT I'll probably replace the factory Motorcraft with a replacement Motorcraft this summer. For the original, I would like to put into long term storage. How long? Good question. Let's assume 10-20 years for the sake of discussion. At work I would evacuate something like this and charge it with nitrogen gas. But that is not practical at home. I would imagine that the steps would be to drain it, rinse with distilled water, then purge with air (nitrogen better). Then place in a strong zip lock bag with desiccant packs. I'm not expecting that in 20 years I'll be able to fill with acid and charge it, but at least I would have the factory battery that looks good and is not falling apart. Any ideas out there?