diff --git a/drivers/charger/emul_sbs_charger.c b/drivers/charger/emul_sbs_charger.c
index 7e5202b6f79..c8c71527674 100644
--- a/drivers/charger/emul_sbs_charger.c
+++ b/drivers/charger/emul_sbs_charger.c
@@ -72,6 +72,7 @@ static int sbs_charger_emul_transfer_i2c(const struct emul *target, struct i2c_m
 	/* Largely copied from emul_sbs_gauge.c */
 	struct sbs_charger_emul_data *data;
 	unsigned int val;
+	uint16_t value;
 	int reg;
 	int rc;
 
@@ -79,6 +80,21 @@ static int sbs_charger_emul_transfer_i2c(const struct emul *target, struct i2c_m
 
 	i2c_dump_msgs_rw(target->dev, msgs, num_msgs, addr, false);
 	switch (num_msgs) {
+	case 1:
+		if (msgs->flags & I2C_MSG_READ) {
+			LOG_ERR("Unexpected single-message read");
+			return -EIO;
+		}
+		if (msgs->len != 3) {
+			LOG_ERR("Unexpected msg0 length %d", msgs->len);
+			return -EIO;
+		}
+		reg = msgs->buf[0];
+
+		value = sys_get_le16(&(msgs->buf[1]));
+
+		rc = emul_sbs_charger_reg_write(target, reg, value);
+		break;
 	case 2:
 		if (msgs->flags & I2C_MSG_READ) {
 			LOG_ERR("Unexpected read");
@@ -113,7 +129,7 @@ static int sbs_charger_emul_transfer_i2c(const struct emul *target, struct i2c_m
 			if (msgs->len != 2) {
 				LOG_ERR("Unexpected msg1 length %d", msgs->len);
 			}
-			uint16_t value = sys_get_le16(msgs->buf);
+			value = sys_get_le16(msgs->buf);
 
 			rc = emul_sbs_charger_reg_write(target, reg, value);
 		}
diff --git a/drivers/charger/sbs_charger.c b/drivers/charger/sbs_charger.c
index 15a5eeea773..75746ea61cf 100644
--- a/drivers/charger/sbs_charger.c
+++ b/drivers/charger/sbs_charger.c
@@ -40,11 +40,12 @@ static int sbs_cmd_reg_read(const struct device *dev, uint8_t reg_addr, uint16_t
 static int sbs_cmd_reg_write(const struct device *dev, uint8_t reg_addr, uint16_t val)
 {
 	const struct sbs_charger_config *config = dev->config;
-	uint8_t buf[2];
+	uint8_t buf[3];
 
-	sys_put_le16(val, buf);
+	buf[0] = reg_addr;
+	sys_put_le16(val, &buf[1]);
 
-	return i2c_burst_write_dt(&config->i2c, reg_addr, buf, sizeof(buf));
+	return i2c_write_dt(&config->i2c, buf, sizeof(buf));
 }
 
 static int sbs_cmd_reg_update(const struct device *dev, uint8_t reg_addr, uint16_t mask,