Thanks for the advice. Will check it out again. Though it does have lots of switching options which I don't need. I will be using raleighnut's system of charging a powerbank and then recharging from that. That approach seems to avoid lots of complications with neurotic devices switching on and off because they don't like what they are being fed. Ah raleighnut, i guess that you have (so far) ignored the siren call of the smartphone Me too, I use a nice Samsung which i can easily recharge from the anker powerbank. "Smart" touring comms is via a tough as boots 7 inch tab which is pretty good on battery use. It has osmand on it to complement the Garmin running from rechargeable AAs.