As I have mentioned previously do not configure Duracell or Energizer D-cell batteries in parallel as one battery will often go "South" and rapidly discharge the other battery. Under no circumstances store or place equipment on the shelf with the batteries in parallel. Example BC-611.
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http://k4che.com/BC-611%20Filament.htm

On 2/26/2023 2:32 AM, Robert Downs via MRCA wrote:

If you plan to run the receiver filaments off of parallel D-cells, don’t use DuraCell. Two or more in parallel get very hot very quickly.

Robert Downs