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@Nick.Earthloop
I have a pair of hope vision ones, and I run both of them on high for just over 2 hours a day in winter. I got fed up with swapping 8 NiMH batteries in and out every day, so I bought one of these and wired it in:
Anker® Astro E5 15000mAh Portable Charger Ultra-High: Amazon.co.uk: Electronics
Now I have 10 hours of runtime. I've also wired my moon shield and moon comet into it, so I no-longer have to charge those individually either. Taking lights permanently cabled together on and off the bike took a bit of getting used to, but now it's quite smooth: unclip all the lights, gather up, drop into the pannier that holds the battery.