Edit: the 2nd one there is a XiaoMi like what Keirin has. I’ve read a couple of good reviews of them on FB bikepacking pages. FWIW I’ve got a XiaoMi phone which works pretty great.
tbh, i reckon i’d prefer something pretty light & portable as if i’m in my car i can always charge my phone off my ciggie lighter, so something that’ll do similar for in the pannier or whatever would be good. how much juice do high lumen lights need? just got a 760 lumen clip on as no more dynamo…
+1 for Xiaomi. Great quality. Best value. Great deals show up frequently on the ozbargain web site. I also believe there are reviews online that tell you which chargers are really pass through if that is important to you
Keep in mind you’ll probably (or should, at least?) have your phone on airplane mode, so your battery will likely last heeeeaps longer. You might not need such a large battery pack.
Having said that I carry a 10,000mAh battery cos if my phone’s dead I get way too anxious.
Check out ozbargain for heeeeaps of cheap battery deals.