In our experience, once products have undergone dangerous goods testing, it can take up to 4 weeks before they are fully marketable again, despite classification.
As I have seen many a logistics centre from the inside and have not only been dealing with Amazon since yesterday, my guess as to how something like this works:
Goods are subjected to dangerous goods testing and moved to a special warehouse/storage area. No matter what it is, there is always the initial suspicion (especially with lithium batteries) that it is dangerous goods and poses a risk to a normal logistics centre.
Then - after the documents have been submitted - the item is inspected. I do not believe that an exemption order (as with normal AA or AAA batteries) is sufficient for your lithium batteries, we submit extensive documents and test certificates for our installed batteries. If you don't submit everything here, Amazon may not be able to classify the product correctly (Classification not possible).
A decision will then be made: Dangerous goods that can either be sold via FBA (use of the HAZMAT programme required) or notvs. no dangerous goods.
And then, depending on the classification, the goods are restocked and this takes up to 4 weeks (in one case this year it was 6 weeks), in our experience. The 48 hours refer ONLY to the inspection of the goods, not until they are ready for sale again.
