Originally Posted by
noglider
I bought this on your recommendation. I've only used it a little bit since buying it. So far, so good. But it is much bigger and heavier than I had expected. It weighs one pound! I might decide to buy a smaller one, maybe one third or one half the size, for when I don't want to lug a one-pound battery.
Yeah, you don't need a back-up battery that big. A 4000mAh back-up should be enough to get you through a ride. When I upgraded my phone this year I got a bigger internal battery so likely I won't need extra but its' nice to have back-up just in case.
I wouldn't mind having one of the newer Garmin 810 or 1000 but damn they want so much money for one of those. Actually though I've been very happy using the Locus app for my Android. Even if I want to use it in an area where cell coverage might be weak I have the option to buy localized "off-line" maps. Since the Locus app already lets me use openstreet(cycle ) maps ( on-line ) they already include a whole lot of good bike/hiking trails. So far I've been very satisfied using my smart phone for bike navigation for both road and trails. Now if you can't afford the data service then a dedicated bicycle GPS unit would be the way to go.