Index: firmware/App/Modes/ModeDrain.c
===================================================================
diff -u -rd8c4c523f0551a95c3c6ee5cf5b693f75161d163 -rb3b1fa54f778d9f202c28bb1970db2616367f0b1
--- firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision d8c4c523f0551a95c3c6ee5cf5b693f75161d163)
+++ firmware/App/Modes/ModeDrain.c	(.../ModeDrain.c)	(revision b3b1fa54f778d9f202c28bb1970db2616367f0b1)
@@ -115,7 +115,11 @@
     LOAD_CELL_ID_T drainWeightLoadCell = LOAD_CELL_A1;
 
     // determine which load cell to use for drain volume - we want weight of inactive reservoir
+#ifndef BETA_V1_BUILD
+    if ( RESERVOIR_2 == getActiveReservoir() )
+#else
     if ( RESERVOIR_1 == getActiveReservoir() )
+#endif
     {
         drainWeightLoadCell = LOAD_CELL_B1;
     }