diff --git a/power.bak b/power.bak
index 31acd9f..49303f2 100644
--- a/power.bak
+++ b/power.bak
@@ -752,7 +752,8 @@ F 0 "R8" V 4180 5200 50  0000 C CNN
 F 1 "1k" V 4100 5200 50  0000 C CNN
 F 2 "Resistor_SMD:R_0603_1608Metric" V 4030 5200 50  0001 C CNN
 F 3 "" H 4100 5200 50  0000 C CNN
-F 4 "RC0603FR-071KL" V 4100 5200 50  0001 C CNN "MFG_PN"
+F 4 "www.yageo.com" V 4100 5200 50  0001 C CNN "MFG_URL"
+F 5 "RC0603FR-071KL" V 4100 5200 50  0001 C CNN "MFG_PN"
 	1    4100 5200
 	1    0    0    -1  
 $EndComp
@@ -1475,8 +1476,6 @@ Wire Wire Line
 	900  3450 1550 3450
 Wire Wire Line
 	900  3850 1550 3850
-Wire Wire Line
-	1950 3250 1950 3150
 Wire Wire Line
 	4300 3900 4300 4000
 Wire Wire Line
@@ -1545,16 +1544,16 @@ Connection ~ 7650 1050
 $Comp
 L power:+3V3 #PWR027
 U 1 1 591C4E6A
-P 1950 3150
-F 0 "#PWR027" H 1950 3000 50  0001 C CNN
-F 1 "+3V3" H 1950 3290 50  0000 C CNN
-F 2 "" H 1950 3150 50  0000 C CNN
-F 3 "" H 1950 3150 50  0000 C CNN
-	1    1950 3150
+P 1500 2500
+F 0 "#PWR027" H 1500 2350 50  0001 C CNN
+F 1 "+3V3" H 1500 2640 50  0000 C CNN
+F 2 "" H 1500 2500 50  0000 C CNN
+F 3 "" H 1500 2500 50  0000 C CNN
+	1    1500 2500
 	1    0    0    -1  
 $EndComp
-Text Notes 1700 2900 0    60   ~ 0
-RTC can also be powered from 2.5V\nbut it is easier to route 3.3V
+Text Notes 2100 3200 0    60   ~ 0
+RC network for proper switchover\nto battery at fast fall of VDD.\nSee page 54 NXP PCF8523T datasheet.\nRTC can also be powered from 2.5V\nbut it is easier to route 3.3V
 Text GLabel 2500 4950 0    60   Input ~ 0
 FTDI_nSLEEP
 $Comp
@@ -2363,28 +2362,28 @@ Text GLabel 6050 4600 1    60   Input ~ 0
 $Comp
 L Device:C C47
 U 1 1 5AB6B7B8
-P 950 2650
+P 1650 1850
 AR Path="/5AB6B7B8" Ref="C47"  Part="1" 
 AR Path="/58D51CAD/5AB6B7B8" Ref="C47"  Part="1" 
-F 0 "C47" H 975 2750 50  0000 L CNN
-F 1 "2.2uF" H 975 2550 50  0000 L CNN
-F 2 "Capacitor_SMD:C_0805_2012Metric" H 988 2500 50  0001 C CNN
-F 3 "" H 950 2650 50  0000 C CNN
-F 4 "CC0805MRX5R6BB225" H 950 2650 50  0001 C CNN "MFG_PN"
-	1    950  2650
+F 0 "C47" H 1675 1950 50  0000 L CNN
+F 1 "2.2uF" H 1675 1750 50  0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric" H 1688 1700 50  0001 C CNN
+F 3 "" H 1650 1850 50  0000 C CNN
+F 4 "CC0805MRX5R6BB225" H 1650 1850 50  0001 C CNN "MFG_PN"
+	1    1650 1850
 	1    0    0    -1  
 $EndComp
-Text GLabel 950  2500 1    60   Input ~ 0
+Text GLabel 1650 1700 1    60   Input ~ 0
 2V5_3V3
 $Comp
 L power:GND #PWR025
 U 1 1 5AB6BA00
-P 950 2800
-F 0 "#PWR025" H 950 2550 50  0001 C CNN
-F 1 "GND" H 950 2650 50  0000 C CNN
-F 2 "" H 950 2800 50  0000 C CNN
-F 3 "" H 950 2800 50  0000 C CNN
-	1    950  2800
+P 1650 2000
+F 0 "#PWR025" H 1650 1750 50  0001 C CNN
+F 1 "GND" H 1650 1850 50  0000 C CNN
+F 2 "" H 1650 2000 50  0000 C CNN
+F 3 "" H 1650 2000 50  0000 C CNN
+	1    1650 2000
 	1    0    0    -1  
 $EndComp
 $Comp
@@ -3105,4 +3104,50 @@ F 10 "621-BAT54WSQ-7-F " H 3100 5600 50  0001 C CNN "Distributor1_PN2"
 $EndComp
 Text Label 4100 5400 0    60   ~ 0
 SHD
+$Comp
+L Device:C C55
+U 1 1 5B09EC4B
+P 1500 3050
+F 0 "C55" H 1250 3050 50  0000 L CNN
+F 1 "22uF" H 1300 2950 50  0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric" H 1538 2900 50  0001 C CNN
+F 3 "" H 1500 3050 50  0000 C CNN
+F 4 "www.yageo.com" H 1500 3050 50  0001 C CNN "MFG_URL"
+F 5 "CC0805ZKY5V5BB226 " H 1500 3050 50  0001 C CNN "MFG_PN"
+	1    1500 3050
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR0171
+U 1 1 5B0A3243
+P 1500 3200
+F 0 "#PWR0171" H 1500 2950 50  0001 C CNN
+F 1 "GND" H 1500 3050 50  0000 C CNN
+F 2 "" H 1500 3200 50  0000 C CNN
+F 3 "" H 1500 3200 50  0000 C CNN
+	1    1500 3200
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R R65
+U 1 1 5B0A7AE1
+P 1500 2650
+F 0 "R65" V 1580 2650 50  0000 C CNN
+F 1 "1k" V 1500 2650 50  0000 C CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" V 1430 2650 50  0001 C CNN
+F 3 "" H 1500 2650 50  0000 C CNN
+F 4 "www.yageo.com" V 1500 2650 50  0001 C CNN "MFG_URL"
+F 5 "RC0603FR-071KL" V 1500 2650 50  0001 C CNN "MFG_PN"
+	1    1500 2650
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1500 2800 1500 2850
+Wire Wire Line
+	1500 2850 1950 2850
+Wire Wire Line
+	1950 2850 1950 3250
+Connection ~ 1500 2850
+Wire Wire Line
+	1500 2850 1500 2900
 $EndSCHEMATC
diff --git a/power.sch b/power.sch
index 31acd9f..323a5d7 100644
--- a/power.sch
+++ b/power.sch
@@ -752,7 +752,8 @@ F 0 "R8" V 4180 5200 50  0000 C CNN
 F 1 "1k" V 4100 5200 50  0000 C CNN
 F 2 "Resistor_SMD:R_0603_1608Metric" V 4030 5200 50  0001 C CNN
 F 3 "" H 4100 5200 50  0000 C CNN
-F 4 "RC0603FR-071KL" V 4100 5200 50  0001 C CNN "MFG_PN"
+F 4 "www.yageo.com" V 4100 5200 50  0001 C CNN "MFG_URL"
+F 5 "RC0603FR-071KL" V 4100 5200 50  0001 C CNN "MFG_PN"
 	1    4100 5200
 	1    0    0    -1  
 $EndComp
@@ -1475,8 +1476,6 @@ Wire Wire Line
 	900  3450 1550 3450
 Wire Wire Line
 	900  3850 1550 3850
-Wire Wire Line
-	1950 3250 1950 3150
 Wire Wire Line
 	4300 3900 4300 4000
 Wire Wire Line
@@ -1545,16 +1544,16 @@ Connection ~ 7650 1050
 $Comp
 L power:+3V3 #PWR027
 U 1 1 591C4E6A
-P 1950 3150
-F 0 "#PWR027" H 1950 3000 50  0001 C CNN
-F 1 "+3V3" H 1950 3290 50  0000 C CNN
-F 2 "" H 1950 3150 50  0000 C CNN
-F 3 "" H 1950 3150 50  0000 C CNN
-	1    1950 3150
+P 1500 2500
+F 0 "#PWR027" H 1500 2350 50  0001 C CNN
+F 1 "+3V3" H 1500 2640 50  0000 C CNN
+F 2 "" H 1500 2500 50  0000 C CNN
+F 3 "" H 1500 2500 50  0000 C CNN
+	1    1500 2500
 	1    0    0    -1  
 $EndComp
-Text Notes 1700 2900 0    60   ~ 0
-RTC can also be powered from 2.5V\nbut it is easier to route 3.3V
+Text Notes 2100 3200 0    60   ~ 0
+RC network for proper switchover\nto battery at fast fall of VDD.\nSee page 54 NXP PCF8523T datasheet.\nRTC can also be powered from 2.5V\nbut it is easier to route 3.3V
 Text GLabel 2500 4950 0    60   Input ~ 0
 FTDI_nSLEEP
 $Comp
@@ -2363,28 +2362,28 @@ Text GLabel 6050 4600 1    60   Input ~ 0
 $Comp
 L Device:C C47
 U 1 1 5AB6B7B8
-P 950 2650
+P 1650 1850
 AR Path="/5AB6B7B8" Ref="C47"  Part="1" 
 AR Path="/58D51CAD/5AB6B7B8" Ref="C47"  Part="1" 
-F 0 "C47" H 975 2750 50  0000 L CNN
-F 1 "2.2uF" H 975 2550 50  0000 L CNN
-F 2 "Capacitor_SMD:C_0805_2012Metric" H 988 2500 50  0001 C CNN
-F 3 "" H 950 2650 50  0000 C CNN
-F 4 "CC0805MRX5R6BB225" H 950 2650 50  0001 C CNN "MFG_PN"
-	1    950  2650
+F 0 "C47" H 1675 1950 50  0000 L CNN
+F 1 "2.2uF" H 1675 1750 50  0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric" H 1688 1700 50  0001 C CNN
+F 3 "" H 1650 1850 50  0000 C CNN
+F 4 "CC0805MRX5R6BB225" H 1650 1850 50  0001 C CNN "MFG_PN"
+	1    1650 1850
 	1    0    0    -1  
 $EndComp
-Text GLabel 950  2500 1    60   Input ~ 0
+Text GLabel 1650 1700 1    60   Input ~ 0
 2V5_3V3
 $Comp
 L power:GND #PWR025
 U 1 1 5AB6BA00
-P 950 2800
-F 0 "#PWR025" H 950 2550 50  0001 C CNN
-F 1 "GND" H 950 2650 50  0000 C CNN
-F 2 "" H 950 2800 50  0000 C CNN
-F 3 "" H 950 2800 50  0000 C CNN
-	1    950  2800
+P 1650 2000
+F 0 "#PWR025" H 1650 1750 50  0001 C CNN
+F 1 "GND" H 1650 1850 50  0000 C CNN
+F 2 "" H 1650 2000 50  0000 C CNN
+F 3 "" H 1650 2000 50  0000 C CNN
+	1    1650 2000
 	1    0    0    -1  
 $EndComp
 $Comp
@@ -3105,4 +3104,52 @@ F 10 "621-BAT54WSQ-7-F " H 3100 5600 50  0001 C CNN "Distributor1_PN2"
 $EndComp
 Text Label 4100 5400 0    60   ~ 0
 SHD
+$Comp
+L Device:C C55
+U 1 1 5B09EC4B
+P 1500 3050
+F 0 "C55" H 1250 3050 50  0000 L CNN
+F 1 "22uF" H 1300 2950 50  0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric" H 1538 2900 50  0001 C CNN
+F 3 "" H 1500 3050 50  0000 C CNN
+F 4 "www.yageo.com" H 1500 3050 50  0001 C CNN "MFG_URL"
+F 5 "CC0805ZKY5V5BB226 " H 1500 3050 50  0001 C CNN "MFG_PN"
+	1    1500 3050
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR0171
+U 1 1 5B0A3243
+P 1500 3200
+F 0 "#PWR0171" H 1500 2950 50  0001 C CNN
+F 1 "GND" H 1500 3050 50  0000 C CNN
+F 2 "" H 1500 3200 50  0000 C CNN
+F 3 "" H 1500 3200 50  0000 C CNN
+	1    1500 3200
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R R65
+U 1 1 5B0A7AE1
+P 1500 2650
+F 0 "R65" V 1580 2650 50  0000 C CNN
+F 1 "1k" V 1500 2650 50  0000 C CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" V 1430 2650 50  0001 C CNN
+F 3 "" H 1500 2650 50  0000 C CNN
+F 4 "www.yageo.com" V 1500 2650 50  0001 C CNN "MFG_URL"
+F 5 "RC0603FR-071KL" V 1500 2650 50  0001 C CNN "MFG_PN"
+	1    1500 2650
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1500 2800 1500 2850
+Wire Wire Line
+	1500 2850 1950 2850
+Wire Wire Line
+	1950 2850 1950 3250
+Connection ~ 1500 2850
+Wire Wire Line
+	1500 2850 1500 2900
+Text Label 1550 2850 0    60   ~ 0
+RTCVDD
 $EndSCHEMATC
diff --git a/ulx3s.bak b/ulx3s.bak
index 3be236a..a37d5ca 100644
--- a/ulx3s.bak
+++ b/ulx3s.bak
@@ -7,7 +7,7 @@ encoding utf-8
 Sheet 1 11
 Title "ULX3S"
 Date ""
-Rev "1.8.4"
+Rev "1.8.6"
 Comp "FER+RIZ+RADIONA"
 Comment1 "Root sheet"
 Comment2 ""
diff --git a/ulx3s.sch b/ulx3s.sch
index f1ef9a8..a37d5ca 100644
--- a/ulx3s.sch
+++ b/ulx3s.sch
@@ -7,7 +7,7 @@ encoding utf-8
 Sheet 1 11
 Title "ULX3S"
 Date ""
-Rev "1.8.5"
+Rev "1.8.6"
 Comp "FER+RIZ+RADIONA"
 Comment1 "Root sheet"
 Comment2 ""