diff --git a/src/data/unify_ios_android.R b/src/data/unify_ios_android.R
index 7abb02e8..eaa69139 100644
--- a/src/data/unify_ios_android.R
+++ b/src/data/unify_ios_android.R
@@ -3,9 +3,12 @@ source("packrat/init.R")
 library(dplyr)
 
 unify_ios_battery <- function(ios_battery){
-    ios_battery <- ios_battery %>%
-        mutate(battery_status = replace(battery_status, battery_status == 3, 5),
-            battery_status = replace(battery_status, battery_status == 1, 3))
+    # We only need to unify battery data for iOS client V1. V2 does it out-of-the-box
+    # V1 will not have rows where battery_status is equal to 4
+    if(nrow(ios_battery %>% filter(battery_status == 4)) == 0)
+        ios_battery <- ios_battery %>%
+            mutate(battery_status = replace(battery_status, battery_status == 3, 5),
+                battery_status = replace(battery_status, battery_status == 1, 3))
 }
 
 unify_ios_calls <- function(ios_calls){