diff -Nru upower-0.9.15.orig/src/linux/up-device-supply.c upower-0.9.15/src/linux/up-device-supply.c
--- upower-0.9.15.orig/src/linux/up-device-supply.c	2011-12-03 14:09:57.000000000 +0100
+++ upower-0.9.15/src/linux/up-device-supply.c	2012-02-28 18:23:46.392531386 +0100
@@ -694,10 +694,8 @@
 			percentage = 100.0f;
 	}
 
-	/* device is a peripheral and not providing power to the computer */
-	if (energy < 0.01f &&
-	    energy_rate < 0.01f &&
-	    energy_full < 0.01f) {
+	/* device is not reporting charge or energy, try to read the percentage */
+	if (energy_full < 0.01f) {
 		percentage = sysfs_get_double (native_path, "capacity");
 	}