diff --git a/content/hardware/01.mkr/01.boards/mkr-1000-wifi/tech-specs.yml b/content/hardware/01.mkr/01.boards/mkr-1000-wifi/tech-specs.yml
index d63b1698fb..22ee631e03 100644
--- a/content/hardware/01.mkr/01.boards/mkr-1000-wifi/tech-specs.yml
+++ b/content/hardware/01.mkr/01.boards/mkr-1000-wifi/tech-specs.yml
@@ -20,7 +20,7 @@ Communication:
   SPI: Yes
 Power:
   I/O Voltage: 3.3V
-  Input Voltage (nominal): 5V
+  Input Voltage (nominal): 5-5.5V
   DC Current per I/O pin: 7 mA
   Supported battery: Li-Po Single Cell, 3.7V, 1024mAh Minimum
   Battery connector: JST
diff --git a/content/hardware/01.mkr/01.boards/mkr-fox-1200/tech-specs.yml b/content/hardware/01.mkr/01.boards/mkr-fox-1200/tech-specs.yml
index d153cf7ae1..6c3fc692bb 100644
--- a/content/hardware/01.mkr/01.boards/mkr-fox-1200/tech-specs.yml
+++ b/content/hardware/01.mkr/01.boards/mkr-fox-1200/tech-specs.yml
@@ -22,7 +22,7 @@ Communication:
   SPI: Yes
 Power:
   I/O Voltage: 3.3V
-  Input Voltage (nominal): 5V
+  Input Voltage (nominal): 5-5.5V
   DC Current per I/O pin: 7 mA
   Supported battery: 2x AA or AAA
   Battery connector: Screw terminals
diff --git a/content/hardware/01.mkr/01.boards/mkr-gsm-1400/tech-specs.yml b/content/hardware/01.mkr/01.boards/mkr-gsm-1400/tech-specs.yml
index 4ad11cf043..6b336aa4c4 100644
--- a/content/hardware/01.mkr/01.boards/mkr-gsm-1400/tech-specs.yml
+++ b/content/hardware/01.mkr/01.boards/mkr-gsm-1400/tech-specs.yml
@@ -29,7 +29,7 @@ Communication:
   SPI: Yes
 Power:
   I/O Voltage: 3.3V
-  Input Voltage (nominal): 5-17V
+  Input Voltage (nominal): 5-7V
   DC Current per I/O pin: 7 mA
   Supported battery: Li-Po Single Cell, 3.7V, 2500mAh Minimum
   Battery connector: JST
diff --git a/content/hardware/01.mkr/01.boards/mkr-nb-1500/tech-specs.yml b/content/hardware/01.mkr/01.boards/mkr-nb-1500/tech-specs.yml
index c71926ded9..8860115e95 100644
--- a/content/hardware/01.mkr/01.boards/mkr-nb-1500/tech-specs.yml
+++ b/content/hardware/01.mkr/01.boards/mkr-nb-1500/tech-specs.yml
@@ -25,7 +25,7 @@ Communication:
   SPI: Yes
 Power:
   I/O Voltage: 3.3V
-  Input Voltage (nominal): 5-17V
+  Input Voltage (nominal): 5-7V
   DC Current per I/O pin: 7 mA
   Supported battery: Li-Po Single Cell, 3.7V, 1500mAh minimum
   Battery connector: JST
diff --git a/content/hardware/01.mkr/01.boards/mkr-vidor-4000/tech-specs.yml b/content/hardware/01.mkr/01.boards/mkr-vidor-4000/tech-specs.yml
index 109ffef719..c8efdc568f 100644
--- a/content/hardware/01.mkr/01.boards/mkr-vidor-4000/tech-specs.yml
+++ b/content/hardware/01.mkr/01.boards/mkr-vidor-4000/tech-specs.yml
@@ -22,7 +22,7 @@ Microcontroller block:
     SPI: Yes
   Power:
     I/O Voltage: 3.3V
-    Input Voltage (nominal): 5-17V
+    Input Voltage (nominal): 5-7V
     DC Current per I/O pin: 7 mA
     Supported battery: Li-Po Single Cell, 3.7V, 1024mAh Minimum
     Battery connector: JST
diff --git a/content/hardware/01.mkr/01.boards/mkr-wan-1300/tech-specs.yml b/content/hardware/01.mkr/01.boards/mkr-wan-1300/tech-specs.yml
index 7a7618924d..a29537b7bb 100644
--- a/content/hardware/01.mkr/01.boards/mkr-wan-1300/tech-specs.yml
+++ b/content/hardware/01.mkr/01.boards/mkr-wan-1300/tech-specs.yml
@@ -22,7 +22,7 @@ Communication:
   SPI: Yes
 Power:
   I/O Voltage: 3.3V
-  Input Voltage (nominal): 5V
+  Input Voltage (nominal): 5-5.5V
   DC Current per I/O pin: 7 mA
 Battery:
   Maximum input voltage (battery): 3.3V
diff --git a/content/hardware/01.mkr/01.boards/mkr-wan-1310/tech-specs.yml b/content/hardware/01.mkr/01.boards/mkr-wan-1310/tech-specs.yml
index c207aa9c24..080ec42a27 100644
--- a/content/hardware/01.mkr/01.boards/mkr-wan-1310/tech-specs.yml
+++ b/content/hardware/01.mkr/01.boards/mkr-wan-1310/tech-specs.yml
@@ -22,7 +22,7 @@ Communication:
   SPI: Yes
 Power:
   I/O Voltage: 3.3V
-  Input Voltage (nominal): 5V
+  Input Voltage (nominal): 5-7V
   DC Current per I/O pin: 7 mA
   Supported battery: Li-Po Single Cell, 3.7V, 1024mAh Minimum
   Battery connector: JST
diff --git a/content/hardware/01.mkr/01.boards/mkr-zero/tech-specs.yml b/content/hardware/01.mkr/01.boards/mkr-zero/tech-specs.yml
index 6c54d428f9..c2e4cd9388 100644
--- a/content/hardware/01.mkr/01.boards/mkr-zero/tech-specs.yml
+++ b/content/hardware/01.mkr/01.boards/mkr-zero/tech-specs.yml
@@ -16,7 +16,7 @@ Communication:
   SPI: Yes
 Power:
   I/O Voltage: 3.3V
-  Input Voltage (nominal): 5V
+  Input Voltage (nominal): 5-5.5V
   DC Current per I/O pin: 7 mA
   Supported battery: Li-Po single cell, 3.7V, 700mAh minimum
   Battery connector: JST