diff --git a/src/battery/battery.go b/src/battery/battery.go
index e69de29..2dec70f 100644
--- a/src/battery/battery.go
+++ b/src/battery/battery.go
@@ -0,0 +1,13 @@
+package battery
+
+/*
+   define battery types
+
+   each battery needs
+
+   number of cells
+   nominal cell voltage
+   max cell voltage
+   min cell voltage
+   series internal resistance
+*/
diff --git a/src/data/data.go b/src/data/data.go
index e69de29..7f01d70 100644
--- a/src/data/data.go
+++ b/src/data/data.go
@@ -0,0 +1,14 @@
+package data
+
+/*
+
+   this package should deal with packaging data to and from the device, loading csv
+
+   pack to device
+
+   unpack from device
+   
+   load and save csv profiles
+
+   nice to have, average selected profiles
+*/