diff -uNr upower-0.99.5/src/linux/up-device-supply.c upower-0.99.5-patched/src/linux/up-device-supply.c
--- upower-0.99.5/src/linux/up-device-supply.c	2017-04-10 13:16:37.000000000 +0200
+++ upower-0.99.5-patched/src/linux/up-device-supply.c	2017-08-18 01:50:57.029084961 +0200
@@ -272,16 +272,14 @@
 	} while (i != supply->priv->energy_old_first);
 
 	/* Check that at least 3 points were involved in computation */
-	if (sum_x == 0.0f || valid_values < 3)
+	if (valid_values < 3)
 		return supply->priv->rate_old;
 
 	/* Compute the discharge per hour, and not per second */
 	rate /= sum_x / SECONDS_PER_HOUR_F;
 
-	/* if the rate is zero, use the old rate. It will usually happens if no
-	 * data is in the buffer yet. If the rate is too high, i.e. more than,
-	 * 100W don't use it. */
-	if (rate == 0.0f || rate > 100.0f)
+	/* If the rate is too high, i.e. more than 100W don't use it. */
+	if (rate > 100.0f)
 		return supply->priv->rate_old;
 
 	return rate;