DGM test is required by Airlines to allow the goods with battery to be shipped by air. When the battery is under 100WH, if DGM test is passed, the goods with battery can be shipped by air. The cost is USD100.00 per battery type per shipment. The DGM test is conducted before shipment and after the order is finished, the lead time is about 3 days. Generally the DGM cost is at buyer's expense.