diff --git a/src/board/system76/common/acpi.c b/src/board/system76/common/acpi.c
index 9f6642d..7efb403 100644
--- a/src/board/system76/common/acpi.c
+++ b/src/board/system76/common/acpi.c
@@ -128,6 +128,14 @@ uint8_t acpi_read(uint8_t addr) {
 
         ACPI_8(0x68, acpi_ecos);
 
+        case 0xBC:
+            data = battery_get_start_threshold();
+            break;
+
+        case 0xBD:
+            data = battery_get_end_threshold();
+            break;
+
         ACPI_8(0xCC, sci_extra);
 
         ACPI_8(0xCE, DCR2);
@@ -177,6 +185,14 @@ void acpi_write(uint8_t addr, uint8_t data) {
             acpi_ecos = data;
             break;
 
+        case 0xBC:
+            battery_set_start_threshold(data);
+            break;
+
+        case 0xBD:
+            battery_set_end_threshold(data);
+            break;
+
 #if HAVE_LED_AIRPLANE_N
         // Airplane mode LED
         case 0xD9: