diff --git a/lib-bms-protocol/src/lib.rs b/lib-bms-protocol/src/lib.rs
index 3704cd9..006b1dd 100644
--- a/lib-bms-protocol/src/lib.rs
+++ b/lib-bms-protocol/src/lib.rs
@@ -8,6 +8,8 @@ mod types;
 use embedded_hal::i2c::{I2c, Operation, SevenBitAddress};
 use thiserror::Error;
 
+use crate::types::Transit_U26;
+
 pub const BMS_I2C_ADDRESS: u8 = 0x55;
 
 pub trait BmsReadable {
@@ -38,6 +40,12 @@ where
     }
 }
 
+impl From<crate::types::U26Error> for BmsProtocolError {
+    fn from(_error: crate::types::U26Error) -> Self {
+        Self::I2cCommunicationError
+    }
+}
+
 #[derive(Debug)]
 pub struct BmsSoftwareReset;
 
@@ -73,7 +81,8 @@ impl BmsReadable for ProtocolVersion {
                 Operation::Read(&mut version),
             ],
         )?;
-        Ok(ProtocolVersion(u32::from_be_bytes(version)))
+        let transit = Transit_U26::from_be_bytes(version)?;
+        Ok(ProtocolVersion(u32::from(transit)))
     }
 }
 
@@ -96,7 +105,8 @@ impl BmsReadable for FirmwareVersion {
                 Operation::Read(&mut version),
             ],
         )?;
-        Ok(FirmwareVersion(u32::from_be_bytes(version)))
+        let transit = Transit_U26::from_be_bytes(version)?;
+        Ok(FirmwareVersion(u32::from(transit)))
     }
 }
 
@@ -127,9 +137,9 @@ impl BmsReadable for Config {
             ],
         )?;
         Ok(Config {
-            capacity_mah: u32::from_be_bytes(capacity_mah),
-            v_full_mv: u32::from_be_bytes(v_full_mv),
-            v_empty_mv: u32::from_be_bytes(v_empty_mv),
+            capacity_mah: u32::from(Transit_U26::from_be_bytes(capacity_mah)?),
+            v_full_mv: u32::from(Transit_U26::from_be_bytes(v_full_mv)?),
+            v_empty_mv: u32::from(Transit_U26::from_be_bytes(v_empty_mv)?),
         })
     }
 }
@@ -167,11 +177,11 @@ impl BmsReadable for BatteryState {
             ],
         )?;
         Ok(BatteryState {
-            lifetime_capacity_mah: u32::from_be_bytes(lifetime_capacity_mah),
-            remaining_capacity_mah: u32::from_be_bytes(remaining_capacity_mah),
-            current_mv: u32::from_be_bytes(current_mv),
+            lifetime_capacity_mah: u32::from(Transit_U26::from_be_bytes(lifetime_capacity_mah)?),
+            remaining_capacity_mah: u32::from(Transit_U26::from_be_bytes(remaining_capacity_mah)?),
+            current_mv: u32::from(Transit_U26::from_be_bytes(current_mv)?),
             temperature_celcius: i32::from_be_bytes(temperature_celcius),
-            health_percent: u32::from_be_bytes(health_percent),
+            health_percent: u32::from(Transit_U26::from_be_bytes(health_percent)?),
         })
     }
 }
@@ -194,9 +204,9 @@ impl BmsReadable for ChargeInfoWindowSec {
                 Operation::Read(&mut charge_info_window_sec),
             ],
         )?;
-        Ok(ChargeInfoWindowSec(u32::from_be_bytes(
+        Ok(ChargeInfoWindowSec(u32::from(Transit_U26::from_be_bytes(
             charge_info_window_sec,
-        )))
+        )?)))
     }
 }
 
@@ -206,11 +216,12 @@ impl BmsWriteable for ChargeInfoWindowSec {
         I: I2c<SevenBitAddress>,
     {
         let cmd = BmsRegisterMap::ChargoInfoWindowTotalSecs;
+        let transit = Transit_U26::try_from(self.0)?;
         i2c_dev.transaction(
             BMS_I2C_ADDRESS,
             &mut [
                 Operation::Write(&(cmd as u32).to_be_bytes()),
-                Operation::Write(&self.0.to_be_bytes()),
+                Operation::Write(&transit.to_be_bytes()),
             ],
         )?;
         Ok(())
@@ -250,11 +261,11 @@ impl BmsReadable for ChargeInfo {
             ],
         )?;
         Ok(ChargeInfo {
-            total_charge_ma: u32::from_be_bytes(total_charge_ma),
-            total_discharge_ma: u32::from_be_bytes(total_discharge_ma),
-            max_charge_mw: u32::from_be_bytes(max_charge_mw),
-            max_discharge_mw: u32::from_be_bytes(max_discharge_mw),
-            avg_voltage_mv: u32::from_be_bytes(avg_voltage_mv),
+            total_charge_ma: u32::from(Transit_U26::from_be_bytes(total_charge_ma)?),
+            total_discharge_ma: u32::from(Transit_U26::from_be_bytes(total_discharge_ma)?),
+            max_charge_mw: u32::from(Transit_U26::from_be_bytes(max_charge_mw)?),
+            max_discharge_mw: u32::from(Transit_U26::from_be_bytes(max_discharge_mw)?),
+            avg_voltage_mv: u32::from(Transit_U26::from_be_bytes(avg_voltage_mv)?),
         })
     }
 }