With no charger connected, that file has no content.
After connecting to the Computer it still has no content - well, it takes as long as it took me to write this to change state, it's now 'usb'.

However, there's another file in that directory called 'IsCharging' - that one is '0' with no charger connected, and immediately changed to '1' with a charger connected.

The same happens when I disconnect the charger - 'IsCharging' changes to '0' immediately, 'ChargerType' takes longer to become empty again.

It's the same with a wall plug although the lag is shorter for 'ChargerType'.

Wouldn't 'IsCharging' be more reliable, since Situations doesn't differentiate between types of chargers anyhow?
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Since I have your attention, one more question:

Erasing network cells seems to be taking as long as recording them.
In fact, atm it seems to be stuck on 5 cells (was 8).
Why? Isn't it just erasing files?
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BTW, my Sailfish device is a Sony Xperia XA2.
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Thank you for all the good work.