USB charger - bombproof?

We seem highly reliant on USB charging, mostly through the micro USB ports. That's used for our phones/satnav/ battery pack/ tablet/ mediaplayer/etc...

Recent problems resulted in throwing away some unreliable cables and buying two new USB chargers:

Standard type Anker powerdrive :
which seem to have a very good reputation.
And less conventional:
Dual output DC to DC converter
Which should give a 3A charging from a very wide range of input voltages from 8V to 22V so that's anything from a flat leisure battery to solar power panel. Epoxy encapsulated to waterproof and shockproof.

I've got it permanently wired up in the camper. The quiescent power use should be minimal, but I'd prefer to put a switch on just in case.


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