diff --git a/.gitea/workflows/build_and_test.yml b/.gitea/workflows/build_and_test.yml
index a6c1774ca..1bb6f53de 100644
--- a/.gitea/workflows/build_and_test.yml
+++ b/.gitea/workflows/build_and_test.yml
@@ -411,6 +411,12 @@ jobs:
     # was not already run, and a release build is the one case where the wait is pure delay.
     if: "!(github.event_name == 'workflow_dispatch' && (github.event.inputs.create_release == 'true' || github.event.inputs.create_release == true))"
     runs-on: jfjoch_rocky8
+    # The battery (battery.yml) runs on the same machine and GPU, and its rugnux takes the card's
+    # memory as its sets need it: a GPU test beside it finds the card full, and a GPU out-of-memory
+    # ends the run by design. One at a time, in the battery's own concurrency group.
+    concurrency:
+      group: battery
+      cancel-in-progress: false
     container:
       image: gitea.psi.ch/leonarski_f/jfjoch_rocky8:2609
       options: --gpus all