We need to get approval from shipping carrier to ship Lithium Metal Cells / Batteries by Air. Normally it will take 1 week to get approval. So please expect 1 week delay.  The following are how to obtain approval:

Lithium Metal Batteries UN 3090 Section IA and Section IB: how to obtain preapproval

Shippers must be preapproved by FedEx Express Dangerous Goods Administration in order to ship lithium metal batteries, UN 3090 Section IA and Section IB.

Obtain Preapproval
Shippers must submit the following information to be considered by FedEx Express Dangerous Goods Administration for approval to ship primary lithium batteries.

1. FedEx account number
2. Company name and complete address (include country for orders outside the U.S.)
3. Contact name(s) and phone number (in case of questions related to the preapproval) Type of preapproval requested (fully regulated UN 3090, lithium metal batteries [primary non-rechargeable])
4. A detailed description and digital photos or diagrams of your inner packaging. Packaging must be designed to protect the battery terminals from contact with another lithium battery or cell (or metal or any item that is capable of conducting electricity) in order to prevent short-circuiting.
5. Proof of UN/DOT 38.3 test

Submit the above information to dgadmin@fedex.com. Information must be submitted in English. Please allow two business days for a response from FedEx. If you are unable to send your request via email, please contact the Dangerous Goods/Hazardous Materials Hotline at 1.800.GoFedEx 1.800.463.3339 (say "dangerous goods") to discuss other means to submit your request for approval.