wrong battery percentage with 2 batteries laptop

[akrram09]

i have thinkpad t470s with 2 batteries i noticed that i3status battery percentage is wrong it displaying that i have 64.71% but waybar displaying 89%
here is 2 battery info

Battery 0: Not charging, 79%
Battery 1: Discharging, 98%, 03:39:14 remaining

EDIT: doing last_full_capacity = true fixed it

[student-sx]

I have a similar problem with my thinkpad T570. I created the following script to investigate it:

#!/bin/bash
OUTPUT_FILE="battery_info.txt"

BAT0_ENERGY_FULL=$(cat /sys/class/power_supply/BAT0/energy_full 2>/dev/null || echo "N/A")
BAT1_ENERGY_FULL=$(cat /sys/class/power_supply/BAT1/energy_full 2>/dev/null || echo "N/A")
BAT0_ENERGY_NOW=$(cat /sys/class/power_supply/BAT0/energy_now 2>/dev/null || echo "N/A")
BAT1_ENERGY_NOW=$(cat /sys/class/power_supply/BAT1/energy_now 2>/dev/null || echo "N/A")

BAT0_ENERGY_MIN=$(cat /sys/class/power_supply/BAT0/energy_min 2>/dev/null || echo "0")
BAT1_ENERGY_MIN=$(cat /sys/class/power_supply/BAT1/energy_min 2>/dev/null || echo "0")
BAT0_CAPACITY=$(cat /sys/class/power_supply/BAT0/capacity 2>/dev/null || echo "N/A")
BAT1_CAPACITY=$(cat /sys/class/power_supply/BAT1/capacity 2>/dev/null || echo "N/A")


BAT0_USABLE_NOW=$((BAT0_ENERGY_NOW - BAT0_ENERGY_MIN))
BAT1_USABLE_NOW=$((BAT1_ENERGY_NOW - BAT1_ENERGY_MIN))

BAT0_USABLE_FULL=$((BAT0_ENERGY_FULL - BAT0_ENERGY_MIN))
BAT1_USABLE_FULL=$((BAT1_ENERGY_FULL - BAT1_ENERGY_MIN))

TOTAL_USABLE_NOW=$((BAT0_USABLE_NOW + BAT1_USABLE_NOW))
TOTAL_USABLE_FULL=$((BAT0_USABLE_FULL + BAT1_USABLE_FULL))

if [ "$TOTAL_USABLE_FULL" -gt 0 ]; then
    CALC_PERCENT=$(awk "BEGIN {printf \"%.2f\", ($TOTAL_USABLE_NOW/$TOTAL_USABLE_FULL)*100}")
else
    CALC_PERCENT="N/A"
fi

I3STATUS_OUTPUT=$(i3status | head -n 3 | tail -n 1)
I3STATUS_BAT=$(echo "$I3STATUS_OUTPUT" | grep -oE '(CHR|BAT) [0-9]+(\.[0-9]+)?%' | awk '{print $2}')

{
    echo "BAT0 energy_full: $BAT0_ENERGY_FULL"
    echo "BAT1 energy_full: $BAT1_ENERGY_FULL"
    echo "BAT0 energy_now: $BAT0_ENERGY_NOW"
    echo "BAT1 energy_now: $BAT1_ENERGY_NOW"
    echo "BAT0 energy_min: $BAT0_ENERGY_MIN"
    echo "BAT1 energy_min: $BAT1_ENERGY_MIN"
    echo "BAT0 capacity: $BAT0_CAPACITY"
    echo "BAT1 capacity: $BAT1_CAPACITY"
    echo "Calculated battery status (formula: (energy_now-energy_min)/(energy_full-energy_min)): $CALC_PERCENT%"
    echo "i3status battery status: $I3STATUS_BAT"
} > "$OUTPUT_FILE"

If I run it with last_full_capacity = true it gives this output:

BAT0 energy_full: 22490000
BAT1 energy_full: 19680000
BAT0 energy_now: 21980000
BAT1 energy_now: 14020000
BAT0 energy_min: 0
BAT1 energy_min: 0
BAT0 capacity: 97
BAT1 capacity: 71
Calculated battery status (formula: (energy_now-energy_min)/(energy_full-energy_min)): 85.37%
i3status battery status: 85.44%

However if I use last_full_capacity = false it reports this (some minutes later while charging)

BAT0 energy_full: 22490000
BAT1 energy_full: 19680000
BAT0 energy_now: 21980000
BAT1 energy_now: 15320000
BAT0 energy_min: 0
BAT1 energy_min: 0
BAT0 capacity: 97
BAT1 capacity: 77
Calculated battery status (formula: (energy_now-energy_min)/(energy_full-energy_min)): 88.45%
i3status battery status: 66.68%