Ive been running one of these off a USB battery in my frame bag, super bright and great value. Also been properly soaked in some quality Yorkshire rain. Absolute bargain. I've been using one but bought 2, going to double up when we get into deep dark winter.
On an Anker 5200 Mah battery that's a couple of years old, I get around 4-5 hours full beam. I've got a 15000mah as well with dual USB ports but not tried that yet.
Ive been running one of these off a USB battery in my frame bag, super bright and great value. Also been properly soaked in some quality Yorkshire rain. Absolute bargain. I've been using one but bought 2, going to double up when we get into deep dark winter.
http://m.ebay.co.uk/itm/1200-Lumen-T6-LED-Bicycle-Light-Headlamp-Headlight-USB-WaterProof-OutDoor-Active-/142062667967?var=&hash=item21139848bf%3Am%3Ams88FY9mWx_4OChx2xCjAzA&_trkparms=pageci%253A400a2377-9bb9-11e6-97bb-74dbd1a00ec0%257Cparentrq%253A02a429251580a3589681d760fff9aad6%257Ciid%253A5