Improve battery script

- try to find battery name
- mension producer and battery name
- accept missing to discharge

bin/battery

@@ -3,14 +3,19 @@
 import sys
 import re
 from sys import stdout
-from os import path
+from os import path, environ
+from os.path import join, isdir
 from collections import namedtuple, OrderedDict
 from termcolor import colored
 
 
 POWER_CLASS = '/sys/class/power_supply'
-BATTERY = 'cw2015-battery'
-UEVENT = path.join(POWER_CLASS, BATTERY, 'uevent')
+BATTERIES = (
+	environ.get('BATTERY', 'BAT0'),
+	'cw2015-battery'
+)
+BATTERY = list(filter(lambda bat: isdir(join(POWER_CLASS, bat)), BATTERIES))[0]
+UEVENT = join(POWER_CLASS, BATTERY, 'uevent')
 DISCHARNGING = 'Discharging'
 
 
@@ -18,6 +23,8 @@ BatteryInfo = namedtuple(
 	'BatteryInfo', 
 	[
 		'name', 
+        'model',
+        'manufacturer',
 		'technology', 
 		'capacity', 
 		'status', 
@@ -50,11 +57,13 @@ def read_battery(filename):
 def load_battery_info(info):
 	return BatteryInfo(
 		name = info['POWER_SUPPLY_NAME'],
+        model = info['POWER_SUPPLY_MODEL_NAME'],
+        manufacturer = info['POWER_SUPPLY_MANUFACTURER'],
 		technology = info['POWER_SUPPLY_TECHNOLOGY'],
 		capacity = float(info['POWER_SUPPLY_CHARGE_FULL']) / 1e6,
 		status = info['POWER_SUPPLY_STATUS'],
 		currrent_percent = int(info['POWER_SUPPLY_CAPACITY']),
-		time_to_empty = int(info['POWER_SUPPLY_TIME_TO_EMPTY_NOW']),
+		time_to_empty = int(info.get('POWER_SUPPLY_TIME_TO_EMPTY_NOW', 0)),
 		charging_current = int(float(info['POWER_SUPPLY_CURRENT_NOW']) / 1e3)
 	)
 
@@ -77,13 +86,16 @@ def format_percent(info):
 
 
 def format_time_to_empty(info):
-	hours = info.time_to_empty // 60
-	minutes = info.time_to_empty % 60
-	return terminal_colored(f"{hours}:{minutes:02d}", 'cyan')
+	if info.time_to_empty == 0:
+		return '??:??'
+	else:
+		hours = info.time_to_empty // 60
+		minutes = info.time_to_empty % 60
+		return terminal_colored(f"{hours}:{minutes:02d}", 'cyan')
 
 
 def print_battery_detail(info):
-	print(f"Battery: {info.technology} {info.name} {info.capacity} Ah")
+	print(f"Battery: {info.model} - {info.manufacturer}: {info.technology} {info.capacity} Ah")
 	print("Battery level: " + format_percent(info))
 	print("Battery status: " + format_status(info))
 	if info.status == DISCHARNGING: