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+#!/bin/bash
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+# Waybar custom/battery module.
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+# Bar text: battery icon + capacity%. Tooltip: time remaining + performance settings.
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+
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+bat=$(ls -d /sys/class/power_supply/BAT* 2>/dev/null | head -1)
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+[ -z "$bat" ] && { echo '{"text":"?","tooltip":"No battery found","class":"unknown"}'; exit 0; }
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+
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+cap=$(cat "$bat/capacity" 2>/dev/null || echo 0)
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+status=$(cat "$bat/status" 2>/dev/null || echo Unknown)
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+ac=$(cat /sys/class/power_supply/AC/online 2>/dev/null || echo 0)
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+
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+# --- charge/energy figures (this laptop reports charge_* in uAh, current_* in uA) ---
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+now=$(cat "$bat/charge_now" 2>/dev/null || cat "$bat/energy_now" 2>/dev/null || echo 0)
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+full=$(cat "$bat/charge_full" 2>/dev/null || cat "$bat/energy_full" 2>/dev/null || echo 0)
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+rate=$(cat "$bat/current_now" 2>/dev/null || cat "$bat/power_now" 2>/dev/null || echo 0)
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+
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+# --- time remaining ---
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+time_str="calculating…"
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+if [ "$rate" -gt 0 ] 2>/dev/null; then
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+ if [ "$status" = "Discharging" ]; then
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+ secs=$(( now * 3600 / rate ))
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+ label="remaining"
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+ elif [ "$status" = "Charging" ]; then
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+ secs=$(( (full - now) * 3600 / rate ))
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+ label="until full"
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+ else
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+ secs=0; label=""
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+ fi
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+ if [ "$secs" -gt 0 ]; then
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+ h=$(( secs / 3600 )); m=$(( (secs % 3600) / 60 ))
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+ time_str="${h}h ${m}m ${label}"
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+ fi
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+fi
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+[ "$status" = "Full" ] && time_str="fully charged"
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+
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+# --- performance settings ---
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+prof=$(cat /sys/firmware/acpi/platform_profile 2>/dev/null || echo "n/a")
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+gov=$(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor 2>/dev/null || echo "n/a")
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+epp=$(cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference 2>/dev/null || echo "n/a")
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+if [ "$ac" = "1" ]; then tlp="AC mode ⚡"; else tlp="battery mode 🔋"; fi
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+
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+# --- icon by capacity (FontAwesome) ---
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+if [ "$cap" -ge 90 ]; then icon=$(printf '') # full
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+elif [ "$cap" -ge 65 ]; then icon=$(printf '') # three-quarters
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+elif [ "$cap" -ge 40 ]; then icon=$(printf '') # half
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+elif [ "$cap" -ge 15 ]; then icon=$(printf '') # quarter
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+else icon=$(printf '') # empty
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+fi
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+bolt=$(printf '')
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+
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+if [ "$status" = "Charging" ] || [ "$ac" = "1" ]; then
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+ text="$bolt $icon ${cap}%"
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+else
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+ text="$icon ${cap}%"
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+fi
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+
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+# --- css class ---
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+class="$status"
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+if [ "$cap" -le 15 ] && [ "$status" = "Discharging" ]; then class="critical discharging"
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+elif [ "$cap" -le 30 ] && [ "$status" = "Discharging" ]; then class="warning discharging"
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+fi
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+
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+tooltip="Battery: ${cap}% (${status})\n${time_str}\n\nPower profile: ${prof}\nCPU governor: ${gov}\nCPU EPP: ${epp}\nTLP: ${tlp}"
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+
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+printf '{"text": "%s", "tooltip": "%s", "class": "%s", "percentage": %s}\n' "$text" "$tooltip" "$class" "$cap"
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