Is there a reason why this can't just be a regular page like the rest of them? 🙂

I wanted to built something like this on my own, but saw your PR - thank you and I hope it gets merged at some point.

After compiling the script, I can however not open the battery page, when selecting it on a monochrome display, I get the error that battery_voltage.lua was not found. After moving the file to the SCRIPTS/BF/PAGES folder (currently it is in the SCRIPTS/BF folder), it finds the file, but then I get the error

Syntax error
?:0
attempt to index field 'fields' (a nil value).

Looking through the other page files, all start with

local template = assert(loadScript(radio.template))()
local margin = template.margin
local indent = template.indent
local lineSpacing = template.lineSpacing
local tableSpacing = template.tableSpacing
local sp = template.listSpacing.field
local yMinLim = radio.yMinLimit
local x = margin
local y = yMinLim - lineSpacing
local inc = { x = function(val) x = x + val return x end, y = function(val) y = y + val return y end }
local labels = {}
local fields = {}

and have a different syntax. So I think it needs to be modified to work, before it can be merged.

Also you set the MSP commands to 210 and 211 - however they are defined as

#define MSP_SELECT_SETTING              210  // in message:  Select setting number (0-2)
#define MSP_SET_HEADING                 211  // in message:  Define a new heading hold direction

So would that even work?