Check for both "BAT" (for BAT0) and "bat" (for "battery").
Only patch the .c file so makefile don't attempt to re-run valac.

James 2015

diff -ur vattery-0.7.5-old/src/battery.c vattery-0.7.5/src/battery.c
--- vattery-0.7.5-old/src/battery.c	2012-06-18 04:13:44.000000000 +0700
+++ vattery-0.7.5/src/battery.c	2015-04-03 15:29:05.140083821 +0700
@@ -780,6 +780,8 @@
 				gboolean _tmp15_ = FALSE;
 				_tmp10_ = name;
 				_tmp11_ = g_str_has_prefix (_tmp10_, "BAT");
+				if (!_tmp11_) 
+					_tmp11_ = g_str_has_prefix (_tmp10_, "bat");
 				if (!_tmp11_) {
 					_g_free0 (name);
 					continue;