@Paul-Slater-0 Cheers from Austria,
I´ve travelled approx. 15k km now with my Fossibot F101Pro. Rugged, huge battery that lasts 10-11 hours with display switched on on highest brightness possible. It´s not a top notch item, but it fits my requirements of navigation running all day (in offline mode - I don´t have a sim card in it) and playing music to my HS. It cost me less than €150,-- on Amazon.
But: if you choose something rugged with huge battery, be aware that regular phone holders won´t work. Those beasts are bricks. And they are heavy! I use an SP Connect SPC mount. The universal interface is glued to the mobile with 3M 4936 - that is the stuff they use e.g. in Dubai to gloo the windows in the skyscrapers. I would not recomment using the standard adhesive that comes with those mounting solutions, because the will not be able to hold the weight and lose grip when temperatures get high!
Hope this helps.
Regards,
André