Alinco DR-600T Battery Replacement
The Alinco DR-600T uses a BR-2032-1F2 Lithium battery. This is a standard BR-2032 coin type battery with attached tabs, and insulation around the edge. The new model number BR-2032-F2N has replaced the older model number.
While I was able to find plenty of (tab-less) CR-2032 batteries locally, a review of a Panasonic data sheet indicated that a different chemistry is used in the CR series, and that the original BR chemistry seemed better suited to the harsh environment in my vehicle.
The BR-2032-F2N batteries (former BR-2032-1F2) can be obtained from major electronic supply outlets. My most recent one came from Digi-Key out of Thief River Falls, MN. My last one (installed in 2002) came from Mouser Electronics. Allied Electronics also carries them in their catalog.
I would have liked to have added a battery holder so that I wouldn't have solder in a new battery down the road, but I couldn't find one with the proper dimensions and thin enough to hold the battery without shorting out after adding the shielded back to the control head (I use a separation cable in my installation).
I've attached a photo of the inside of my DR-600T control head showing the BR-2032-F2N in the upper right hand corner.
Hopefully, this information will help anyone looking to replace this battery in the future.