diff --git a/esphome/components/teleinfo/teleinfo.cpp b/esphome/components/teleinfo/teleinfo.cpp
index 91a0d0e16f5..b4e474dea4b 100644
--- a/esphome/components/teleinfo/teleinfo.cpp
+++ b/esphome/components/teleinfo/teleinfo.cpp
@@ -6,30 +6,30 @@ namespace esphome::teleinfo {
 ESPHOME_LOG_TAG(TAG, "teleinfo");
 
 /* Helpers */
-static int get_field(char *dest, char *buf_start, char *buf_end, int sep, int max_len) {
-  char *field_end;
+static int get_field(char *dest, uint8_t *buf_start, uint8_t *buf_end, int sep, int max_len) {
+  uint8_t *field_end;
   int len;
 
-  field_end = static_cast<char *>(memchr(buf_start, sep, buf_end - buf_start));
+  field_end = static_cast<uint8_t *>(memchr(buf_start, sep, buf_end - buf_start));
   if (!field_end)
     return 0;
   len = field_end - buf_start;
   if (len >= max_len)
     return len;
-  strncpy(dest, buf_start, len);
+  memcpy(dest, buf_start, len);
   dest[len] = '\0';
 
   return len;
 }
 /* TeleInfo methods */
-bool TeleInfo::check_crc_(const char *grp, const char *grp_end) {
+bool TeleInfo::check_crc_(const uint8_t *grp, const uint8_t *grp_end) {
   int grp_len = grp_end - grp;
   if (grp_len < this->checksum_area_end_) {
     ESP_LOGE(TAG, "Empty or too short group");
     return false;
   }
   uint8_t raw_crc = grp[grp_len - 1];
-  uint8_t crc_tmp = sum_bytes(reinterpret_cast<const uint8_t *>(grp), grp_len - this->checksum_area_end_);
+  uint8_t crc_tmp = sum_bytes(grp, grp_len - this->checksum_area_end_);
 
   crc_tmp &= 0x3F;
   crc_tmp += 0x20;
@@ -46,7 +46,8 @@ bool TeleInfo::read_chars_until_(bool drop, uint8_t c) {
 
   while (available() > 0 && j < 128) {
     j++;
-    received = read();
+    if (!read_byte(&received))
+      break;
     if (received == c)
       return true;
     if (drop)
@@ -87,9 +88,9 @@ void TeleInfo::loop() {
         state_ = END_FRAME_RECEIVED;
       break;
     case END_FRAME_RECEIVED:
-      char *buf_finger;
-      char *grp_end;
-      char *buf_end;
+      uint8_t *buf_finger;
+      uint8_t *grp_end;
+      uint8_t *buf_end;
       int field_len;
 
       buf_finger = buf_;
@@ -116,7 +117,7 @@ void TeleInfo::loop() {
        * 0xa | Tag | 0x9 | Timestamp | 0x9 | 0x9 | CRC | 0xd
        *
        */
-      while ((buf_finger = static_cast<char *>(memchr(buf_finger, (int) 0xa, buf_end - buf_finger)))) {
+      while ((buf_finger = static_cast<uint8_t *>(memchr(buf_finger, (int) 0xa, buf_end - buf_finger)))) {
         /*
          * Make sure timesamp is nullified between each tag as some tags don't
          * have a timestamp
@@ -126,7 +127,7 @@ void TeleInfo::loop() {
         buf_finger += 1;
 
         /* Group len */
-        grp_end = static_cast<char *>(memchr(buf_finger, 0xd, buf_end - buf_finger));
+        grp_end = static_cast<uint8_t *>(memchr(buf_finger, 0xd, buf_end - buf_finger));
         if (!grp_end) {
           ESP_LOGE(TAG, "No group found");
           break;
diff --git a/esphome/components/teleinfo/teleinfo.h b/esphome/components/teleinfo/teleinfo.h
index b1bf586e9c2..39f02874113 100644
--- a/esphome/components/teleinfo/teleinfo.h
+++ b/esphome/components/teleinfo/teleinfo.h
@@ -33,7 +33,7 @@ class TeleInfo final : public PollingComponent, public uart::UARTDevice {
  protected:
   int checksum_area_end_;
   int separator_;
-  char buf_[MAX_BUF_SIZE];
+  uint8_t buf_[MAX_BUF_SIZE];
   uint32_t buf_index_{0};
   char tag_[MAX_TAG_SIZE];
   char val_[MAX_VAL_SIZE];
@@ -45,7 +45,7 @@ class TeleInfo final : public PollingComponent, public uart::UARTDevice {
     END_FRAME_RECEIVED,
   } state_{STATE_OFF};
   bool read_chars_until_(bool drop, uint8_t c);
-  bool check_crc_(const char *grp, const char *grp_end);
+  bool check_crc_(const uint8_t *grp, const uint8_t *grp_end);
   void publish_value_(const std::string &tag, const std::string &val);
 };
 }  // namespace esphome::teleinfo