Command to get details on charge and time remaining for two batteries

Question

I have a laptop with two batteries. I would like to get combined details on the two batteries. In particular, I'd like the time remaining before both batteries run out of charge and the percentage charge left in both batteries. Is there a command to do this?

When I run:

acpi -b

I get the following output:

Battery 0: Full, 100%
Battery 1: Discharging, 80%, 05:10:03 remaining

So I'd like a command that instead gives me something like:

All batteries: Discharging 90%, 10:10:06 remaining

Answer 1

Here's my script. It depends on acpi and acpitool

It:

1. Outputs the average percent of all batteries in the device

2. How long it'll take for all batteries to fully charge (if the device is plugged in), or how long until it becomes completely empty (if not plugged in),

3. Says if the device is being charged.

The final output is in the format All batteries: Discharging 90%, 10:10:06 remaining (with different numbers and Discharging can be Charging).

#!/bin/bash

get_time_until_charged() {

    # parses acpitool's battery info for the remaining charge of all batteries and sums them up
    sum_remaining_charge=$(acpitool -B | grep -E 'Remaining capacity' | awk '{print $4}' | grep -Eo "[0-9]+" | paste -sd+ | bc);

    # finds the rate at which the batteries being drained at
    present_rate=$(acpitool -B | grep -E 'Present rate' | awk '{print $4}' | grep -Eo "[0-9]+" | paste -sd+ | bc);

    # divides current charge by the rate at which it's falling, then converts it into seconds for `date`
    seconds=$(bc <<< "scale = 10; ($sum_remaining_charge / $present_rate) * 3600");

    # prettifies the seconds into h:mm:ss format
    pretty_time=$(date -u -d @${seconds} +%T);

    echo $pretty_time;
}

get_battery_combined_percent() {

    # get charge of all batteries, combine them
    total_charge=$(expr $(acpi -b | awk '{print $4}' | grep -Eo "[0-9]+" | paste -sd+ | bc));

    # get amount of batteries in the device
    battery_number=$(acpi -b | wc -l);

    percent=$(expr $total_charge / $battery_number);

    echo $percent;
}

get_battery_charging_status() {

    if $(acpi -b | grep --quiet Discharging)
    then
        echo "Discharging";
    else # acpi can give Unknown or Charging if charging, https://unix.stackexchange.com/questions/203741/lenovo-t440s-battery-status-unknown-but-charging
        echo "Charging";
    fi
}

echo "All batteries: $(get_battery_charging_status) $(get_battery_combined_percent)%, $(get_time_until_charged ) remaining";