diff --git a/src/cli_struct.rs b/src/cli_struct.rs
index e69de29..26ea107 100644
--- a/src/cli_struct.rs
+++ b/src/cli_struct.rs
@@ -0,0 +1,37 @@
+use clap::Parser;
+
+
+#[derive(Parser, Debug)]
+pub struct CliArgs {
+    /// IP address of the controller
+    #[arg(short, long)]
+    pub ip_string: String,
+
+    /// the address to find the load device (HP606n) on the GPIB bus
+    #[arg(short, long)]
+    pub gpib_addr: u8,
+
+    /// the current to draw from the battery in Amps
+    #[arg(short='d', long)]
+    pub discharge_current: f64,
+
+    /// the range for the current sensor on the machine. this differs on different machines,
+    /// so check which range best matches your discharge current.
+    /// This field is the index of the range, so for the 6063B which has ranges [0, 1A] and [0, 10A],
+    /// you would enter `0` for discharge currents less than 1A, and `1` otherwise
+    #[arg(short='c', long, default_value_t = 1u8)]
+    pub current_range: u8,
+
+    /// the voltage to stop discharging the battery.
+    #[arg(short='v', long, default_value_t = 0f64)]
+    pub cutoff_voltage: f64,
+
+    /// path and name for the output file
+    #[arg(short='p', long)]
+    pub output_file: String,
+
+    /// number of times to check the voltage per minute.
+    /// This affects cutoff voltage checks if set too low.
+    #[arg(short='r', long)]
+    pub polling_rate: f64
+}
\ No newline at end of file
diff --git a/src/errors.rs b/src/errors.rs
index e69de29..93ea6a6 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -0,0 +1,33 @@
+use std::net::AddrParseError;
+use std::num::{ParseFloatError, ParseIntError};
+use std::string::FromUtf8Error;
+use std::time::SystemTimeError;
+use prologix_gpib_ethernet_controller_manager::errors::GpibControllerError;
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum BatTestError {
+    #[error("Error trying to send or receive data: {0}")]
+    TcpIoError(#[from] std::io::Error),
+    #[error("reqwest error: {0}")]
+    ReqwestError(#[from] reqwest::Error),
+    #[error("error parsing integer from a string: {0}")]
+    ParseIntError(#[from] ParseIntError),
+    #[error("error parsing string from TCPStream: {0}")]
+    ParseStringError(#[from] FromUtf8Error),
+    #[error("error parsing Ip address: {0}")]
+    ParseIpAddressError(#[from] AddrParseError),
+    #[error("error in GPIB controller library: {0}")]
+    ControllerLibraryError(#[from] GpibControllerError),
+    #[error("error in CSV library: {0}")]
+    CsvError(#[from] csv::Error),
+    #[error("error parsing Float: {0}")]
+    ParseFloatError(#[from] ParseFloatError),
+    #[error("error with system time: {0}")]
+    SystemTimeError(#[from] SystemTimeError),
+    #[error("Error converting path to string")]
+    PathToStringError,
+    #[error("Error converting scientific notation string to float")]
+    SciNotParseError
+
+}
\ No newline at end of file