I strongly recommend that you call Whites Electronics. (I don't know why people don't call the factory? That's the first resource you should utilize. Sorry, I'm not trying to be harsh, but people just assume because the detector is old the factory must not make them anymore. That may be the case but always call them & ask!! If you had, you'd have a battery right now. Someone just recently was asking where to get a 4C battery pack & I told him the factory still has them for $7.95. Come on guys pick up the telephone & call the company) I just ordered a rechargeable battery for my old Eagle II SL that I bought in 1990 and I believe they may have batteries for yours as well. Once their supply of rechargeable batteries for their old detectors has been depleted they will no longer be getting any more! They have decided to no longer sell batteries for their old detectors as the company that made the charging units can no longer supply them & Whites doesn't want to sell the batteries without also offering charging units as well. This is what they told me last week over the telephone. They have already run out of the chargers & only have the batteries left but once they are gone, they will not be getting anymore!! I also have a wall charger for my Eagle II SL thank God & I bought a car charger for it from the Tulsa OK office last week as a backup since they are no longer being sold. I was told there were none left in the country. When Whites in Tulsa said, "we're out." I said "how about auto chargers?" She said, "wait a minute, I forgot about those, maybe we do?" She left, came back to the phone & said, "wow, I got 3 left." So I bought one & there are 2 left now in the U.S. The Sweet Home Oregon corporate office called all the offices up & rounded up all the chargers. She said "we told them we didn't have any left." The only reason I got that charger was because Whites in Tulsa forgot they had it & told corporate they were out. Call them ASAP! Get a battery now if you still can! (My brother in law has a 6000D & he was still able to get a rechargeable battery for it just recently. At first the girl said they didn't have a battery for it, then he explained his battery pack with the AA batteries & she said, "Oh, yeah, we have one!" This was 2 weeks ago!) Good luck!