Battery Adapter, PRC-90-2; NSN 5940-01-484-6261; Part # 30003-1794AS0988. This adapter screws into the battery well of the PRC-90 radio allowing the use of 4 CR-123 Batteries. CR-123 batteries are readily available and are lithium so there is no deterioration. The BA-5368 battery for the PRC-90 is hard to find and very expensive. The 3rd picture shows this battery adapter attached to the PRC-90 radio, it is for demonstration only, the PRC-90 is not included. The existing cap transfers to the battery adapter, therefore these adapters do not come with a cap as it is not needed. Items you will receive are new in sealed package.