You are reading a single comment by @Rod_Munch and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@Rod_Munch
I'm sure this isn't what you're after - but I've managed over 13 hours with the 800 running on pretty low settings. And apparently these can give you an additional 20 hours... (you only need the butt-plug looking thing)
http://www.handtec.co.uk/product.php/4910/garmin-external-battery-pack
I do actually have one and taken it with me on a few rides in case - but i've either not needed it, or I've run them both together intermittently and seemingly ended up with 50% left on each (it will either just charge the main unit or run purely off the external battery).